15. True regarding animals that are chronically exposed to cold:
a. Increased sympathetic stimulation
b. Increased vagal action
c. Increased insulin levels in blood.
d. Decreased blood supply to adipose tissue.
16. True about shunt vessels:
a. Evenly distributed throughout the skin
b. Role in nutrition
c. Play a role in thermoregulation
d. No autonomic nervous regulation
17. Vasomotor centre of medulla is associated with:
a. Acts with cardiovagal centre to maintain BP.
B. Independent of corticohypothalamic inputs.
c. Influenced by baroreceptors, not chemoreceptors
d. Essentially silent in sleep.
18. Energy expenditure in resting state depends on:
a. Lean body mass
b. Adipose tissue
c. Resting heart rate
d. Exercise.
19. The primary direct stimulus for excitation of central chemoreceptors regulating ventilation is:
a. Increased H+
B. Increased CO2
C. increased O2
d. Decreased CO2
20. True regarding myocardial O2 demand:
a. Inversely related to heart rate
b. Has constant relation to external cardiac work
c. Directly proportional to duration of systole.
d. Is negligible at rest.
21. Angiotensin II causes all of the following except:
a. Stimulation of thirst.
b. Aldosterone secretion.
c. Increased ADH secretion
d. Vasodilation.
23. Maximum postprandial motility is seen in :
a. Ascending colon
b. Transverse colon
c. Descending colon
d. Sigmoid colon
24. Which of the following statement is true?
a. Fluid coming from the descending limb of loop of Henle is hypotonic.
b. Descending limb of loop of Henle is permeable to solutes.
c. If clearance of a substance is greater than GFR, then tubular secretion must be present.
d. Clearance of a substance is always more than GFR if there is tubular secretion
25. Nitrogen narcosis is caused is due to:
a. Nitrogen inhibits dismutase enzyme
b. Increased production of nitric oxide
c. Increased solubility of nitrogen in nerve cell membrane
d. Decrease in oxygen free radicals.
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