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Ovulation in the human female normally takes place during the menstrual cycle -
A
Just before the end of the secretory cycle
B
At the beginning of the proliferative phase
C
At the end of the proliferative phase
D
At the mid secretory phase
Detailed Solution
The menstrual cycle (about 28 days) has a menstrual phase (days 1–5), a follicular or proliferative phase (days 5–14) and a luteal or secretory phase (days 15–28).
During the proliferative phase, the Graafian follicle grows and secretes estrogen, which rebuilds the endometrium.
Around day 14, a surge of LH (with FSH) causes the Graafian follicle to rupture and release the secondary oocyte. This is ovulation.
After ovulation the follicle becomes the corpus luteum and the secretory phase begins.
So ovulation normally takes place at the end of the proliferative phase (around the middle of the cycle).
During the proliferative phase, the Graafian follicle grows and secretes estrogen, which rebuilds the endometrium.
Around day 14, a surge of LH (with FSH) causes the Graafian follicle to rupture and release the secondary oocyte. This is ovulation.
After ovulation the follicle becomes the corpus luteum and the secretory phase begins.
So ovulation normally takes place at the end of the proliferative phase (around the middle of the cycle).