A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. The most serious complication of prolonged sitting position is
A. Venous air embolism
D. Nerve palsies
2. Which of the following increases insulin / glucagon molar ratio the most?
A. A large carbohydrate meal
B. Intravenous glucose
C. Overnight fast
D. A small protein meal
3. Which of the following is the best example of a polysynaptic reflex?
A. Stretch reflex
B. Axon reflex
C. Inverse stretch reflex
D. Withdrawal reflex
4. The area in the center of the A band that contains only thick filaments is the
A. Z line.
B. M line.
C. H band.
D. I band.
5. The hypertensive form of congenital adrenal hyperplasia is due to a deficiency of:
A. 11ß hydroxylase
B. 21 hydroxylase
C. 3ß-hydroxysteroid dehydrogenase
D. DHEA sulfokinase
6. During heavy exercise the cardiac output (CO) increase upto five fold while pulmonary arterial pressure rises very little. This physiological ability of the pulmonary circulation is best explained by:
A. Increase in the number of open capillaries
B. Sympathetically mediated greater distensibility of pulmonary vessels
C. Large amount of smooth muscle in pulmonary arteries
D. Smaller surface area of pulmonary circulation
7. A human growth hormone variant (hGH-V) is expressed primarily in:
8. In the management of a child with diabetic ketoacidosis and a plasma pH of 6.9, insulin infusion is typically continued even after plasma glucose is reduced to 250 mg/dL, and glucose is coadministered with insulin. This is done in order to allow:
A. muscle glycogen to be replenished
B. plasma potassium to be normalized
C. plasma osmolality to be reduced rapidly
D. complete oxidation of ketone bodies
9. The most abundant anion in ECF is
D. protein anion
10. The body fluid compartment that contains more osmotically active particles (in relation to other fluid compartments in the same individual) is:
A. intracellular fluid
C. interstitial fluid
D. None of these
11. Stimulation of sympathetic nerves to the pineal gland:
A. increases synthesis of melanin
B. increases activity of serotonin N-acetyl transferase
C. reduces melatonin synthesis
D. increases release of serotonin
12. If an individual is breathing 15 times per minute, respiratory frequency is approximately:
A. 0.1 Hz
B. 0.15 Hz
C. 0.2 Hz
D. 0.25 Hz
13. Under basal conditions, which is the predominant energy substrate utilized by cardiac muscle?
B. Amino acids
D. Fatty acids
14. Glucocorticoids decrease the number of circulating:
C. Both A and B
D. red blood cells
15. The following values are obtained on a sample of serum from a child that has clinical evidence of dehydration.Serum [Na] = 135 mmol/L Serum [glucose] = 540 mg/dL Serum [urea nitrogen] = 56 mg/dLThe osmolaity of serum is expected to be close to:
A. 290 mOsm/kg H2O
B. 300 mOsm/kg H2O
C. 310 mOsm/ kg H2O
D. 320 mOsm/kg H2O
16. Somatostatin inhibits the secretion of:
C. growth hormone
D. All these
17. When myosin cross-bridges bind to the active sites on actin,
A. ATP is hydrolyzed.
B. They pivot toward the M line.
C. The sarcomere strengthens.
D. Muscle relaxation occurs.
18. In an adult female who underwent pelvic surgery, internal genitalia were found to be male, and the karyotype was 46 XY. The most likely explanation for this is:
A. loss of function mutation in SRY gene
B. deficiency of testosterone
C. deficiency of Mullerian inhibiting peptide
D. deficiency of testosterone 5a reductase
19. Which type of rigidity is clinically more common?
A. Decorticate rigidity
B. Decerebrate rigidity
C. Extensor rigidity
D. Cog-wheel rigidity
20. The pattern of electrical and motor activity in the gastrointestinal tract during periods of fasting is called:
A. basic electrical rhythm
B. migrating motor complex
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