Chemical Coordination and Regulation Question 9

9. Changes in GnRH pulse frequency in females is controlled by circulating levels of

[2016]

(a) estrogen and progesterone

(b) estrogen and inhibin

(c) progesterone only

(d) progesterone and inhibin

Show Answer

Answer : a

Hints & Solutions

(a) At the pituitary, GnRH stimulates the synthesis and secretion of the gonadotropins, follicle-stimulating hormone (FSH), and luteinizing hormone $(LH)$. These processes are controlled by the size and frequency of GnRH pulses, as well as by feedback from progesterone and estrogens. Low-frequency GnRH pulses are required for FSH release, whereas high-frequency GnRH pulses stimulate $LH$ pulses in a one to one manner.