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Question 1
Incorrect
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A range of one standard deviation above and below the mean includes what approximate percentage of the sample values:
Your Answer: 0.78
Correct Answer: 0.68
Explanation:A range of one SD above and below the mean (+/- 1 SD) includes 68.2% of the sample values.A range of two SD above and below the mean (+/- 2 SD) includes 95.4% of the sample values.A range of three SD above and below the mean (+/- 3 SD) includes 99.7% of the sample values.
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This question is part of the following fields:
- Evidence Based Medicine
- Statistics
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Question 2
Incorrect
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Regarding renal clearance, which of the following statements is CORRECT:
Your Answer:
Correct Answer: The MDRD equation uses plasma creatinine to estimate the GFR making an adjustment for age, sex and race.
Explanation:Clearance is defined as the volume of plasma that is cleared of a substance per unit time. Inulin clearance is the gold standard for measurement of GFR but creatinine clearance is typically used instead. Creatinine is freely filtered and not reabsorbed, but there is a little creatinine tubular secretion. In practice, GFR is usually estimated from the plasma creatinine using a formula e.g. the MDRD equation making an adjustment for age, sex and race.
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This question is part of the following fields:
- Physiology
- Renal
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Question 3
Incorrect
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Regarding gentamicin, which of the following statements is INCORRECT:
Your Answer:
Correct Answer: Gentamicin typically causes acute glomerulonephritis in toxicity.
Explanation:Gentamicin is the aminoglycoside of choice in the UK and is used widely for the treatment of serious infections. It has a broad spectrum but is inactive against anaerobes and has poor activity against haemolytic streptococci and pneumococci. When used for the blind therapy of undiagnosed serious infections it is usually given in conjunction with a penicillin or metronidazole (or both). The main toxic effects are nephrotoxicity and ototoxicity due to damage to the vestibulocochlear nerve (CN VIII).Gentamicin is contraindicated in myasthenia gravis and should be used with caution in renal disease which may result in accumulation and a greater risk of toxic side effects.
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This question is part of the following fields:
- Infections
- Pharmacology
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Question 4
Incorrect
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The medial and lateral pterygoid muscles are innervated by which of the following nerves:
Your Answer:
Correct Answer: Mandibular division of the trigeminal nerve
Explanation:Both the medial and lateral pterygoids are innervated by the mandibular division of the trigeminal nerve.
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This question is part of the following fields:
- Anatomy
- Head And Neck
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Question 5
Incorrect
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A 10-year-old girl that appears systemically well presents with a honey-crusted scab close to the corner of her mouth and states that the area is slightly itchy but not painful. The diagnosis given was impetigo.What is most likely the mode of transmission of the causative agent of the said diagnosis?
Your Answer:
Correct Answer: Direct contact
Explanation:Impetigo is a common pyoderma that is most often seen in children. Historically, most cases were caused by group A streptococci (GAS; Streptococcus pyogenes), although S. aureus has become the predominant pathogen over the last 15 years.A bullous form of impetigo accounts for approximately 10% of cases. It is caused by strains of S. aureus that produce exfoliative toxins leading to the formation of bullae, which quickly rupture and form a transparent, light brown crust.Impetigo is spread mainly by person-to-person contact; it is rapidly spread through direct transmission. The diagnosis of impetigo can be made from a Gram stain and culture of the vesicular contents.
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This question is part of the following fields:
- Microbiology
- Principles Of Microbiology
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Question 6
Incorrect
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You see a 63-year-old man with a history of melaena and epigastric discomfort. For a few months, he's been taking aspirin.Which of the following statements about aspirin's mechanism of action is correct?
Your Answer:
Correct Answer: It inhibits both COX-1 and COX-2 at medium to high doses (500-5000 mg per day)
Explanation:Aspirin inhibits cyclo-oxygenase irreversibly by covalently acetylating the cyclo-oxygenase active site in both COX-1 and COX-2. The production of prostaglandin and thromboxane is reduced as a result. As a result, platelet activation and aggregation are reduced. A single dose of aspirin has a half-life of 7-10 days, which is the time it takes for the bone marrow to produce new platelets.Aspirin only inhibits COX-1, the enzyme that produces thromboxane A2, at low doses (75 mg per day), and thus has a primarily anti-thrombotic effect.Aspirin inhibits both COX-1 and COX-2 at medium to high doses (500-5000 mg per day). COX-2 is involved in the production of prostaglandins, so it has an anti-inflammatory effect at these concentrations.Aspirin, when used as an antipyretic for a viral illness in children, can cause Reye’s syndrome. Reye’s syndrome is a potentially fatal liver disease that causes encephalopathy and liver failure.The inability of aspirin to reduce platelet production of thromboxane A2, and thus platelet activation and aggregation, is known as aspirin resistance. Although the exact frequency and mechanism of aspirin resistance are unknown, it is thought to affect about 1% of users. Women are more likely than men to experience this phenomenon.According to new research, taking aspirin on a regular basis lowers the risk of colorectal cancer. It may also protect against cancers of the breast, bladder, prostate, and lungs.
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This question is part of the following fields:
- CNS Pharmacology
- Pharmacology
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Question 7
Incorrect
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Mannitol is primarily indicated for which of the following:
Your Answer:
Correct Answer: Cerebral oedema
Explanation:Mannitol is an osmotic diuretic that can be used to treat cerebral oedema and raised intraocular pressure. Mannitol is a low molecular weight compound and is, therefore, freely filtered at the glomerulus and is not reabsorbed. It, therefore, increases the osmolality of the glomerular filtrate and tubular fluid, increasing urinary volume by an osmotic effect. It also does not cross the blood-brain-barrier (BBB).
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This question is part of the following fields:
- Cardiovascular
- Pharmacology
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Question 8
Incorrect
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Which nerve innervates the brachioradialis muscle?
Your Answer:
Correct Answer: The radial nerve
Explanation:Brachioradialis is innervated by the radial nerve (from the root values C5-C6) that stems from the posterior cord of the brachial plexus.
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This question is part of the following fields:
- Anatomy
- Upper Limb
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Question 9
Incorrect
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Which of the following statements about sickle cell disease is TRUE:
Your Answer:
Correct Answer: Hand-foot syndrome is frequently a first presentation of the disease.
Explanation:Hand-foot syndrome in children is typically the first symptom of the disease, produced by infarction of the metaphysis of small bones. The disease is inherited as an autosomal recessive trait. By adulthood, the spleen has usually infarcted. Infection with the B19 parvovirus is usually followed by an aplastic crisis. Thrombocytopenia is caused by splenic sequestration.
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This question is part of the following fields:
- Haematology
- Pathology
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Question 10
Incorrect
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Detection of urinary Bence-Jones protein would be most suggestive of which of the following malignancies:
Your Answer:
Correct Answer: Multiple myeloma
Explanation:Bence Jones proteins are monoclonal immunoglobulin light chains found in urine (and plasma) of some patients with myeloma. Because of their relatively small size, light chains are readily excreted into the urine. The presence of significant amounts of Bence Jones proteins in urine is indicative of malignant B cell proliferation.
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This question is part of the following fields:
- Haematology
- Pathology
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Question 11
Incorrect
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Bile acids are essential for the digestion and absorption of which of the following:
Your Answer:
Correct Answer: Lipids and fat-soluble vitamins
Explanation:Bile acids are synthesised from cholesterol by hepatocyte and excreted into bile. Bile acids are essential for lipid digestion and absorption. Of the bile acids excreted into the intestine, about 95% are reabsorbed into the portal circulation by active transport mechanisms in the distal ileum and recycled by the liver. Many of the bile salts are reabsorbed unaltered, some are converted by intestinal bacteria into secondary bile acids (deoxycholic acid and lithocholic acid) and then reabsorbed and a small proportion escapes reabsorption and is excreted in the faeces.
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This question is part of the following fields:
- Gastrointestinal
- Physiology
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Question 12
Incorrect
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A 32-old woman comes for a follow-up visit after being discharged on medications for her newly diagnosed epilepsy. She now complains of a tremor in her arm when she holds a tray in her hand. You examine the patient and notice she has developed postural tremors. Which of the following medications for epilepsy is most likely responsible for this tremor?
Your Answer:
Correct Answer: Sodium valproate
Explanation:A postural tumour is observed when a person maintains a position against gravity, such as holding the arms outstretched. (The patient holding her tray against gravity) Sodium valproate is the most commonly prescribed medication for epilepsy. It is commonly associated with tremors as valproate-induced tremors occur in around 6-45% of patients. The tremors are commonly postural, but a resting tremor may also occur.Approximately 25% of patients taking sodium valproate are found to develop a tremor within 3-12 months of initiating therapy.
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This question is part of the following fields:
- CNS Pharmacology
- Pharmacology
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Question 13
Incorrect
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The neurotransmitter in the synaptic cleft is either eliminated or deactivated after the postsynaptic cell responds to the neurotransmitter.Which of the following enzymes catalyses the breakdown of noradrenaline?
Your Answer:
Correct Answer: Catechol-O-methyltransferase (COMT)
Explanation:The neurotransmitter in the synaptic cleft is either eliminated or deactivated after the post-synaptic cell responds to the neurotransmitter. This can be accomplished in a variety of ways:Re-uptakeBreakdownDiffusionSerotonin is an example of a neurotransmitter that is uptake. Serotonin is absorbed back into the presynaptic neuron via the serotonin transporter (SERT), which is found in the presynaptic membrane. Re-uptake neurotransmitters are either recycled by repackaging into vesicles or broken down by enzymes.Specific enzymes found in the synaptic cleft can also break down neurotransmitters. The following enzymes are examples of these enzymes:Acetylcholinesterase (AChE) catalyses the acetylcholine breakdown (ACh)The enzyme catechol-O-methyltransferase (COMT) catalyses the breakdown of catecholamines like adrenaline , dopamine and noradrenaline. The breakdown of catecholamines, as well as other monoamines like serotonin, tyramine, and tryptamine, is catalysed by monoamine oxidases (MOA).Diffusion of neurotransmitters into nearby locations can also be used to eliminate them.
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This question is part of the following fields:
- Basic Cellular Physiology
- Physiology
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Question 14
Incorrect
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Which of the following statements is correct regarding flow through the cardiovascular system?
Your Answer:
Correct Answer: Turbulent blood flow may be caused by increased cardiac output.
Explanation:Frictional forces at the sides of a vessel cause a drag force on the fluid touching them in laminar blood flow, which creates a velocity gradient where the flow is greatest at the centre. Laminar blood flow may become disrupted and flow may become turbulent at high velocities, especially in large arteries or where the velocity increases sharply at points of sudden narrowing in the vessels, or across valves. There is increased tendency for thrombi formation when there is turbulent blood flow. Clinically, turbulence may be heard as a murmur or a bruit. As a result of elevated cardiac output, there may be turbulent blood flow, even when the cardiac valves are anatomically normal, and as a result, a physiological murmur can be heard. One such example is pregnancy.
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This question is part of the following fields:
- Basic Cellular
- Physiology
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Question 15
Incorrect
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Regarding the management of gout, which of the following statements is CORRECT:
Your Answer:
Correct Answer: Allopurinol may cause an acute attack of gout when first started.
Explanation:Allopurinol is a treatment for the prevention of gout. The initiation of treatment may precipitate an acute attack, and should be covered with an NSAID or colchicine, continued for at least one month after the hyperuricaemia has been corrected. Colchicine is not indicated for long term prevention of gout. NSAIDs are first line for acute gout; colchicine is an alternative in whom NSAIDs are contraindicated, not tolerated or ineffective (including in people taking anticoagulants). Ibuprofen is not recommended for acute gout, given it has only weak anti-inflammatory properties; naproxen, diclofenac or indometacin are indicated instead.
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This question is part of the following fields:
- Musculoskeletal
- Pharmacology
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Question 16
Incorrect
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Which of the following statements is considered correct regarding Hepatitis B vaccination?
Your Answer:
Correct Answer: The vaccine should be stored between 2 and 8 degrees Centigrade
Explanation:Hepatitis B vaccine should be stored at 35°-46° F (2°-8° C) and should not be frozen.There is no association between hepatitis B vaccination and Guillain-Barre syndrome. Infection with the bacterium Campylobacter jejuni is one of the most common risk factors for GBS. People can also develop GBS after having the flu or other infections (such as cytomegalovirus and Epstein Barr virus).Hepatitis B vaccine is prepared from initial concentration of surface antigen.To ensure adequate immunity, anti-HBs (HBsAb) titres may be checked 4-8 weeks following the last shot of the hepatitis B vaccine series.
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This question is part of the following fields:
- Microbiology
- Principles Of Microbiology
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Question 17
Incorrect
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You review a 34-year-old man with lower back pain and plan to prescribe him ibuprofen and codeine phosphate. His only past medical history of note is depression, for which he takes fluoxetine.Which of the following scenarios would prompt you to consider the co-prescription of a PPI for gastro-protection? Select ONE answer only.
Your Answer:
Correct Answer: Co-prescription of fluoxetine
Explanation:Patients at risk of gastro-intestinal ulceration (including the elderly) who need NSAID treatment should receive gastroprotective treatment. The current recommendations by NICE suggest that gastro-protection should be considered if patients have ≥1 of the following:Using maximum recommended dose of an NSAIDAged 65 or olderHistory of peptic ulcer or GI bleedingConcomitant use of medications that increase risk:Low dose aspirinAnticoagulantsCorticosteroidsAnti-depressants including SSRIs and SNRIsRequirements for prolonged NSAID usage:Patients with OA or RA at any ageLong-term back pain if older than 45It is suggested that if required, either omeprazole 20 mg daily or lansoprazole 15-30 mg daily should be the PPIs of choice.This patient is on 400 mg of ibuprofen TDS, but the maximum recommended dose of ibuprofen is 2.4 g daily. Co-prescription of codeine, raised BMI, and a family history of peptic ulceration would also not prompt gastro-protection.
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This question is part of the following fields:
- Musculoskeletal Pharmacology
- Pharmacology
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Question 18
Incorrect
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Identify the type of graph described below:This graph is a scatter plot of the effect estimates from individual studies against some measure of each study's size or precision.
Your Answer:
Correct Answer: Funnel plot
Explanation:A funnel plot is a scatter plot of the effect estimates from individual studies against some measure of each study’s size or precision. The standard error of the effect estimate is often chosen as the measure of study size and plotted on the vertical axis with a reversed scale that places the larger, most powerful studies towards the top. The effect estimates from smaller studies should scatter more widely at the bottom, with the spread narrowing among larger studies. In the absence of bias and between study heterogeneity, the scatter will be due to sampling variation alone and the plot will resemble a symmetrical inverted funnel. A triangle centred on a fixed effect summary estimate and extending 1.96 standard errors either side will include about 95% of studies if no bias is present and the fixed effect assumption (that the true treatment effect is the same in each study) is valid.
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This question is part of the following fields:
- Evidence Based Medicine
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Question 19
Incorrect
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Which of the following nerves supplies the abductor pollicis brevis?
Your Answer:
Correct Answer: The recurrent branch of the median nerve
Explanation:Abductor pollicis brevis is innervated by the recurrent (thenar) branch of median nerve (root value C8 and T1).
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This question is part of the following fields:
- Anatomy
- Upper Limb
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Question 20
Incorrect
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A 29-year-old man is diagnosed with a severe case of asthma.In the treatment of acute asthma in adults, which of the following is NOT recommended?
Your Answer:
Correct Answer: Nebulised magnesium
Explanation:There is no evidence to support the use of nebulized magnesium sulphate in the treatment of adults at this time.In adults with acute asthma, the following medication dosages are recommended:By using an oxygen-driven nebuliser, you can get 5 milligrams of salbutamol.500 mcg ipratropium bromide in an oxygen-driven nebuliserOral prednisolone 40-50 mg100 mg hydrocortisone intravenous1.2-2 g magnesium sulphate IV over 20 minutesWhen inhaled treatment is ineffective, intravenous salbutamol (250 mcg IV slowly) may be explored (e.g. a patient receiving bag-mask ventilation).Following senior counsel, current ALS recommendations propose that IV aminophylline be explored in severe or life-threatening asthma. If utilized, a loading dose of 5 mg/kg should be administered over 20 minutes, then a 500-700 mcg/kg/hour infusion should be given. To avoid toxicity, serum theophylline levels should be kept below 20 mcg/ml.
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This question is part of the following fields:
- Pharmacology
- Respiratory Pharmacology
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Question 21
Incorrect
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A young male has presented to the Emergency Department with a sudden onset of severe palpitations, shortness of breath, and chest pain. A 12-lead ECG is recorded, and it shows a narrow complex tachycardia that points to a diagnosis of supraventricular tachycardia. Vagal manoeuvres are attempted but are unsuccessful in eliminating the arrhythmia. The next action plan is to use a drug to revert to sinus rhythm. Out of the following, which is the first-line treatment for supraventricular tachycardia?
Your Answer:
Correct Answer: Adenosine
Explanation:Paroxysmal supraventricular tachycardia is an intermittent tachycardia (HR > 100 bpm) and has the following characteristics:1. Sudden onset/offset (Contrast with sinus tachycardia)2. Electrical activity originates above the ventricle (Contrast with ventricular tachycardia)3. Produces narrow QRS complex (<120ms) The most common cause of PSVT is Atrioventricular nodal re-entrant tachycardia (AVNRT), most common in young women with a mean age onset of 32 years old. There are recurrent episodes of palpitations, and most of the episodes spontaneously. Sometimes, some vagal manoeuvres are required:1. Valsalva manoeuvre2. immersing the face in ice-cold water3. carotid sinus massage.If PSVT keeps persisting or is causing severe symptoms, the treatment of choice is intravenous adenosine. The patient’s ECG should be continuously monitored throughout the treatment. The recommended doses in adults are as follows:- Initial dose of adenosine is 6 mg by rapid IV bolus- If unsuccessful, give another dose of adenosine 12 mg by rapid IV bolus- If unsuccessful, give a further dose of adenosine 12 mg by rapid IV bolusThe latest ALS guidelines advocate 18 mg for the third dose, whereas the BNF/NICE guidelines advocate 12 mg.If adenosine fails or is contraindicated, intravenous verapamil can be used as an alternative, but it should be avoided in patients recently treated with beta-blockers.Synchronized electrical cardioversion will be necessary with signs of hemodynamic instability or if drug treatment has failed to restore sinus rhythm.Recurrent episodes of paroxysmal supraventricular tachycardia can be treated by catheter ablation or prevented with drugs such as flecainide, sotalol, diltiazem, or verapamil.
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This question is part of the following fields:
- Cardiovascular Pharmacology
- Pharmacology
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Question 22
Incorrect
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Which JVP waveform correlates to atrial systole?
Your Answer:
Correct Answer: The a wave
Explanation:JVP Waveform in Cardiac Cycle Physiology: a wave Right atrial contraction causes atrial systole (end diastole). the c wave During right isovolumetric ventricular contraction, the tricuspid valve bulges into the right atrium, resulting in isovolumetric contraction (early systole). descent by x Rapid ventricular ejection (mid systole) is caused by a combination of right atrial relaxation, tricuspid valve downward movement during right ventricular contraction, and blood ejection from both ventricles. the v-wave Ventricular ejection and isovolumetric relaxation (late systole) occur as a result of venous return filling the right atrium. y lineage Ventricular filling occurs when the tricuspid valve opens, allowing blood to flow rapidly from the right atrium to the right ventricle.
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This question is part of the following fields:
- Cardiovascular
- Physiology
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Question 23
Incorrect
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While on morning rounds in the medical ward, the attending physician asks a medical student about the differences between transudates and exudates and their causes. The student explains that a transudate is an excess fluid that leaks out of an intravascular compartment due to an imbalance between oncotic and hydrostatic pressures. Which ONE of the following conditions will he mention as the cause of a transudate?
Your Answer:
Correct Answer: Meig’s syndrome
Explanation:Transudative effusions are caused due to systemic causes leading to increased hydrostatic pressure or decreased oncotic pressure. These include:1) Meig’s Syndrome (Ovarian tumour causing ascites and pleural effusion)2) Congestive heart failure3) Nephrotic Syndrome4) Myxoedema5) Cirrhosis6) SarcoidosisAn exudate is caused by local inflammation and results from increased vascular permeability. Causes include:1) Rheumatoid arthritis2) Pneumonia leading to empyema3) Malignancies4) Pericarditis
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This question is part of the following fields:
- General Pathology
- Pathology
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Question 24
Incorrect
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An elderly patient presents to ED following a fall after feeling light headed when standing up. You are reviewing his medication and note that he is taking a high dose of furosemide. Loop diuretics act primarily at which of the following sites in the nephron:
Your Answer:
Correct Answer: Thick ascending limb
Explanation:Loop diuretics inhibit the Na+/K+/2Cl- symporter on the luminal membrane in the thick ascending limb of the loop of Henle, thus preventing reabsorption of NaCl and water. These agents reduce reabsorption of Cl- and Na+ and increase Ca2+ excretion and loss of K+ and Mg2+.
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This question is part of the following fields:
- Cardiovascular
- Pharmacology
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Question 25
Incorrect
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Which of the following represents ventricular repolarisation on the ECG:
Your Answer:
Correct Answer: T wave
Explanation:P wave = Atrial depolarisationQRS complex = Ventricular depolarisationT wave = Ventricular repolarisation
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This question is part of the following fields:
- Cardiovascular
- Physiology
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Question 26
Incorrect
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A 26-year old female comes to the Emergency Room with complaints of bloody stools. She reports that prior to the passage of bloody stools, she experienced a sharp pain during defecation. Medical history reveals that she has been experiencing constipation for the past 2 weeks. After completing her medical history and physical examination, the attending physician gives an initial diagnosis of an anal fissure.Which of the following nerves transmit painful sensation from the anus, resulting in the pain associated with anal fissure?
Your Answer:
Correct Answer: Inferior rectal nerve
Explanation:A fissure in ano is a tear in the anoderm distal to the dentate line. The pathophysiology of anal fissure is thought to be related to trauma from either the passage of hard stool or prolonged diarrhoea. A tear in the anoderm causes spasm of the internal anal sphincter, which results in pain, increased tearing, and decreased blood supply to the anoderm. The site of the anal fissure in the sensitive lower half of the anal canal, which is innervated by the inferior rectal nerve, results in reflex spasm of the external anal sphincter, aggravating the condition. Because of the intense pain, anal fissures may have to be examined under local anaesthesia.The inferior rectal nerve is a branch of the pudendal nerve. This nerve runs medially across the ischiorectal fossa and supplies the external anal sphincter, the mucous membrane of the lower half of the anal canal, and the perianal skin.
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This question is part of the following fields:
- Abdomen And Pelvis
- Anatomy
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Question 27
Incorrect
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Antidiuretic hormone (ADH) has which of the following effects:
Your Answer:
Correct Answer: Increases urine osmolality
Explanation:ADH binds V2 receptors on renal principal cells in the late distal tubule and collecting ducts, raising cAMP levels and causing intracellular vesicles to fuse with the apical membrane. In their membrane these vesicles have water channels called aquaporins, which increase the water permeability allowing greater water reabsorption and concentration of urine. ADH also binds to V1 receptor receptors on vascular smooth muscle, causing vasoconstriction and enhancing the effect of aldosterone on sodium reabsorption in the distal tubule. ADH release is stimulated primarily by raised plasma osmolality detected by osmoreceptors in the anterior hypothalamus. Other factors that increase ADH release include: extracellular fluid volume depletion, angiotensin II, nausea, pain, stress, exercise, emotion, hypoglycaemia. ADH release is inhibited by low plasma osmolality, alcohol, caffeine, glucocorticoids and atrial natriuretic peptide (ANP). ADH deficiency (or an inadequate response to ADH) results in diabetes insipidus. Excess levels of ADH results in syndrome of inappropriate ADH secretion (SIADH).
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This question is part of the following fields:
- Endocrine
- Physiology
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Question 28
Incorrect
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The following are all examples of type III hypersensitivity EXCEPT for:
Your Answer:
Correct Answer: Goodpasture's syndrome
Explanation:Examples of type III reactions include:Extrinsic allergic alveolitisSystemic lupus erythematosus (SLE)Post-streptococcal glomerulonephritisReactive arthritisRheumatoid arthritis
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This question is part of the following fields:
- Immune Responses
- Pathology
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Question 29
Incorrect
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In the emergency room, a 28-year-old woman complains of wobbly and slurred speech, is unable to do the heel-shin test, and has nystagmus. The following signs are most likely related to damage to which of the following areas:
Your Answer:
Correct Answer: Cerebellum
Explanation:Cerebellar injury causes delayed and disorganized motions. When walking, people with cerebellar abnormalities sway and stagger. Damage to the cerebellum can cause asynergia, the inability to judge distance and when to stop, dysmetria, the inability to perform rapid alternating movements or adiadochokinesia, movement tremors, staggering, wide-based walking or ataxic gait, a proclivity to fall, weak muscles or hypotonia, slurred speech or ataxic dysarthria, and abnormal eye movements or nystagmus.
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This question is part of the following fields:
- Anatomy
- Central Nervous System
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Question 30
Incorrect
SESSION STATS - PERFORMANCE PER SPECIALTY
