21 During respiratory alkalosis a Beta intercalated cells se

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

26. Menopause is characterized by which the following?

      a)       High estrogen levels

      b)       Low GnRH levels

      c)       Low estrogen levels in plasma

      d)       Low levels of FSH in plasma

27. What can follicle stimulation hormone (FSH) secretion be inhibited by?

      a)       Estrogen

      b)       Inhibin

      c)       Progesterone

      d)       a) and b)

      e)       All the above

28. During the proliferative phase:

      a)         Estrogen decreases the growth of spiral arteries

      b)         Estrogen causes cervical mucus to thicken and become sticky

      c)         Estrogen and FSH induce formation of more FSH receptors on granulosa cells

      d)        Estrogen causes an increase in body temperature

29. What initiates the pubertal event in males?

      a)         Increased pulses of GnRH

      b)         Reduced levels of LH

      c)         Reduced FSH levels in plasma

      d)        Reduced Leydig cell function

30. Stimulation of the vagus nerve regulates the function of the stomach by?

      a)       Increasing secretion of pepsinogen

      b)       Increasing histamine secretion

      c)         Increasing motility

      d)        a) and b) are correct

e)         All of the above are correct

Solution

In respiratory alsalosis there is absorption if hydrigen ion nd secretion of bicarbonate ion from beta intercalated cell.

2for oestrogen major source is.it cholesterol.in presence of aromatase testosterone is converted to oestrogen .so optoinA.

3during luteal phase progesterone level remai high secreted from corpus luteum .it maintain endomatrial growth.

4during mid cycle lh surge there is rapid rise in oestoigen level and increasing progesterone level secondary to increase in LH level