Give reason for the following:

(a) The first half of the menstrual cycle is called follicular phase as well as proliferative phase.

(b) The second half of the menstrual cycle is called luteal phase as well as secretory phase.

Asked by Topperlearning User | 11th Jun, 2014, 03:33: PM

Expert Answer:

(a) During follicular phase, primary follicles transform into Graafian follicle under FSH stimulation. Graafian follicles secrete estrogens with stimulate enlargement of endometrium of uterus. So, the first half of the menstrual cycle is called follicular phase as well as proliferative phase.

(b) During luteal phase, corpus luteum is fully formed and secretes a large quantity of progesterone. So, the second half of the menstrual cycle is called luteal phase as well as secretory phase.

Answered by  | 11th Jun, 2014, 05:33: PM