21. During respiratory alkalosis? a) Beta intercalated cells secrete H+ and reab

ID: 3483198 • Letter: 2

Question

21. During respiratory alkalosis?

a) Beta intercalated cells secrete H+ and reabsorb bicarbonate

b) Beta intercalated cells reabsorb bicarbonate and H+

c) Beta intercalated cells secrete bicarbonate and reabsorb H+

d) Alpha intercalated cells secrete H+ and reabsorb bicarbonate

22. Estrogen production from testosterone

a) Requires the enzyme aromatase

b) Occurs in the brain of males

c) Occurs in granulosa cells

d) All the above are correct.

23. Plasma progesterone levels are highest during which phase of the human menstrual cycle?

a) Menstrual phase

b) Follicular Phase

c) Ovulatory Phase

d) Luteal Phase

24. The stimulus which causes the mid-cycle LH surge is______________.

a) Rapidly falling estrogen levels

b) Rapidly falling progesterone levels

c) Rapidly rising estrogen levels and increased progesterone levels

d) Falling inhibin levels

25. Mullerian Inhibitory Substance (MIS) secreted by the dominant follicle

a) Inhibits the sensitivity of non-dominant follicles to LH

b) Inhibits the sensitivity of non-dominant follicles to inhibin

c) Inhibits the sensitivity of non-dominant follicles to FSH

d) Inhibits the sensitivity of non-dominant follicles to estrogen

21. C. Beta intercalated cells secrete bicarbonate and reabsorb H+.

Alpha intercalated cells are known to secrete protons and beta intercalated cells are known to secrete bicarbonate.

22. All are Above.

Aromatase enzyme Catalyses conversion of testosterone into estrogen. This enzyme is found in granulosa cells, brain,placenta and skin.

23. D. Luteal phase.

During Luteal phase,corpus luteum is formed which secretes increased amount of progesterone.

24. C.Rapidly rising estrogen levels and increased progesterone levels.

Increased level of estrogen inhibits secretion of FSH and stimulates secretion of LH.

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