MCQs Week 21 Loading... 1. Pellagra is linked to the deficiency of which water soluble vitamin? B2ANiacinPyridoxine Loading... 2. Regarding the larynx All muscles are supplied by the recurrent laryngeal nerveThyroarytenoid muscle alters the tension of the vocal cordRecurrent laryngeal nerve passes anterior to the cricothyroid jointDuring swallowing, the epiglottis acts as a passive flap Loading... 3. Regarding lead toxicity, which of the following is correct? Prolonged exposure often results in macrocytic anaemiaYoung children absorb around 10% of ingested inorganic leadLead induced peripheral neuropathy classically involves upper limb extensors resulting in wrist dropHigh dose organic lead poisoning usually results in a life-threatening progressive pneumonitis Loading... 4. Which of the following is NOT associated with exposure to ionising radiation? LymphopeniaFibrosisSarcomaPeripheral demyelinating neuropathy Loading... 5. Secretion of potassium will be increased by Metabolic alkalosisHyperaldosteronismSpironolactone administrationThiazide diuretic administration Loading... 6. Regarding heavy metal poisoning The major source of exposure to cadmium is contaminated shellfishArsenic exposure is associated with carcinomasMercury is preferentially toxic to the developing renal system in uteroIndustrial cadmium exposure is associated with cardiomyopathy Loading... 7. With respect to the countercurrent mechanism The loops of Henle act as counter current exchangersSolutes diffuse out of vessels conducting blood towards the cortexWater diffuses out of ascending vessels and into descending vesselsCountercurrent exchange is an active process Loading... 8. Which of the following statements about laxatives is correct? Magnesium hydroxide is well absorbed from the GITThe action of mineral oil depends on its prokinetic propertiesSenna acts to increase colonic activityLiquid paraffin acts by osmotically increasing the volume of the gut contents Loading... 9. Regarding the femoral triangle It is bordered superiorly by the thickened medial margin of the aponeurosis of the internal obliqueIt is bordered medially by the lateral border of adductor magnusThe muscular floor is formed by iliopsoas medially and pectineus laterallyIt is bisected by the femoral artery and vein Loading... 10. The popliteal artery Is a continuation of the femoral artery at the inferior border of the femoral triangleDivides to form the anterior and posterior tibial arteries at the lower border of the popliteusSupplies genicular arteries in a retrograde anastamosis to the posterior compartment of the thighIs a shallow structure within the popliteal fossa Loading... 11. With respect to anti-emetic agents Ondansetron is a dopamine antagonistMetoclopramide increases lower oesophageal sphincter pressureProchlorperazine has its main site of action within the gastrointestinal tractPromethazine acts on H2 receptors Loading... 12. Injury to which nerve results in loss of ankle dorsiflexion and foot eversion? Tibial nerveCommon peroneal nerveSural nerveSaphenous nerve Loading... 13. Filtered sodium is actively transported out of all portions of the renal tubule EXCEPT the Proximal tubuleThin portion of the loop of HenleThick portion of the loop of HenleDistal tubule Loading... 14. Compression of structures in the carpal tunnel usually results in Weakness of flexion of the terminal phalanx of the thumbWeakness of the interossei musclesUnaffected sensation on the palmar surface of the little fingerWeakness of all the lumbrical muscles Loading... 15. The brachialis muscle Arises from the upper third of the humerusInserts into the coronoid process and tuberosity of the ulnaIs a powerful supinator of the forearmAdducts the arm Loading... 16. Which of the following is correct? Aldosterone is secreted in response to an increase in blood pressureAldosterone produces it's effects by increasing membrane permeability to potassiumAldosterone causes an increased reabsorption of hydrogen ions in the kidneyAldosterone exerts it's main effects in the collecting ducts Loading... 17. You are prescribing an anti-emetic for a patient with nausea and are considering the properties of different drugs. Which of the following is true? Diphenhydramine has a use for nausea associated with motion sicknessProchlorperazine is a non-sedating anti-emeticMetoclopramide sites of action are all peripheralOndansetron has higher efficacy and has less adverse effects than granisetron Loading... 18. Which of the following statements is INCORRECT? Carbon monoxide is a non-irritating tasteless gasCarbon monoxide is a highly stable molecule that remains in the atmosphere for a prolonged period before being oxidised to carbon dioxideSystemic hypoxia can occur when the carboxyhaemoglobin level rises above 30%Death can occur when the carboxyhaemoglobin level rises above 60% Loading...
