Answer:
(b)in humans (female), the menstrual
cycle lasts for about 28/29 days. It is the follicular phase in which the
primary follicles in the ovary grow to become a fully mature graafian follicle
(due to FSH stimulation). This phase (follicular) lasts for about 14 days.
The secretion of gonado tropins (LH and
FSH) increases gradually during this phase and stimulates secretion of estrogen
by the growing follicles both LH and FSH attain a peak level in the middle of
cycle (about 14th day).
This rapid secretion of LH
called LH surge, induces rupture of Graafian follicle andthereby the release of
ovum.-This ovulatory phase is followed by the luteal phase during which the
remaining follicular cells enlarge to become the corpus luteum.
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