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Which of the following is the correct matching of the events occurring during menstrual cycle?
A
Menstruation: Breakdown of myometrium and ovum not fertilized
B
Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone
C
Proliferative phase: Rapid regeneration of myometrium and maturation of Graafian follicle
D
Development of corpus luteum: Secretory phase and increased secretion of progesterone
Detailed Solution
After ovulation the remaining part of the Graafian follicle changes into the corpus luteum, which secretes large amounts of progesterone essential for maintaining the endometrium. This is the luteal or secretory phase. So this matching is correct.
Menstruation is due to the breakdown of the endometrial lining of the uterus and its blood vessels; the myometrium (the muscular layer) does not break down.
At ovulation LH and FSH do attain peak levels, but progesterone is not falling sharply then; it rises afterwards, when the corpus luteum forms.
In the proliferative (follicular) phase it is the endometrium that regenerates, not the myometrium.
Hence the correct matching is development of corpus luteum – secretory phase and increased secretion of progesterone.
Menstruation is due to the breakdown of the endometrial lining of the uterus and its blood vessels; the myometrium (the muscular layer) does not break down.
At ovulation LH and FSH do attain peak levels, but progesterone is not falling sharply then; it rises afterwards, when the corpus luteum forms.
In the proliferative (follicular) phase it is the endometrium that regenerates, not the myometrium.
Hence the correct matching is development of corpus luteum – secretory phase and increased secretion of progesterone.