MCQS AND EMQS IN MEDICAL PHYSIOLOGY

Questions 1–7 1. Extracellular fluid in adults differs from intracellular fluid in that its A. Volume is greater. B. Tonicity is lower. C. Anions are mainly inorganic. D. Sodium:potassium molar ratio is higher. E. pH is lower. 2. Blood group antigens (agglutinogens) are A. Carried on the haemoglobin molecule. B. Beta globulins. C. Equally immunogenic. D. Not present in fetal blood. E. Inherited as recessive Mendelian characteristics. 3. Total body water, expressed as a percentage of body weight A. Can be measured with an indicator dilution technique using deuterium oxide. B. Is smaller on average in women than in men. C. Rises following injection of posterior pituitary extracts. D. Falls during starvation. E. Is less than 80 per cent in young adults. 4. Breakdown of erythrocytes in the body A. Occurs when they are 6–8 weeks old. B. Takes place in the reticulo-endothelial system. C. Yields iron, most of which is excreted in the urine. D. Yields bilirubin which is carried by plasma protein to the liver. E. Is required for the synthesis of bile salts. 5. A person with group A blood A. Has anti-B antibody in the plasma. B. May have the genotype AB. C. May have a parent with group O blood. D. May have children with group A or group O blood only. E. Whose partner is also A can only have children of groups A or O. 6. Blood platelets assist in arresting bleeding by A. Releasing factors promoting blood clotting. B. Adhering together to form plugs when exposed to collagen. C. Liberating high concentrations of calcium. D. Releasing factors causing vasoconstriction. E. Inhibiting fibrinolysis by blocking the conversion of plasminogen to plasmin. 7. Plasma bilirubin A. Is a steroid pigment. B. Is converted to biliverdin in the liver. C. Does not normally cross cerebral capillary walls. D. Is freely filtered in the renal glomerulus. E. Is sensitive to light.