Read the graph given above and correlate the uterine events that take

1.	Read the graph given above and correlate the uterine events that take place according to the hormonal levels on: (i) 6–15 days(ii) 16–25 days (iii) 26–28 days (if the ovum is not fertilised)(b) Specify the sources of the hormones mentioned in the graph.
Answer» (a) (i) It is the follicular phase where follicular stimulating hormones (FSH) stimulate the ovarian follicles to secrete estrogen which in turn stimulate the proliferation of the endometrium of the uterine wall. The endometrial lining begins to thicken. (ii) Secretion of progesterone maintains the endometrium which is necessary for implantation of fertilised ovum and other events of pregnancy. (iii) When fertilisation does not take place, the endometrium disintegrates, leading to menstruation marking a new cycle. (b) Estrogen is secreted by the ovarian follicles and progesterone is secreted by the corpus luteum.

Read the graph given above and correlate the uterine events that take place according to the hormonal levels on: (i) 6–15 days(ii) 16–25 days (iii) 26–28 days (if the ovum is not fertilised)(b) Specify the sources of the hormones mentioned in the graph.

Answer»

(a) (i) It is the follicular phase where follicular stimulating hormones (FSH) stimulate the ovarian follicles to secrete estrogen which in turn stimulate the proliferation of the endometrium of the uterine wall. The endometrial lining begins to thicken.

(ii) Secretion of progesterone maintains the endometrium which is necessary for implantation of fertilised ovum and other events of pregnancy.

(iii) When fertilisation does not take place, the endometrium disintegrates, leading to menstruation marking a new cycle.

(b) Estrogen is secreted by the ovarian follicles and progesterone is secreted by the corpus luteum.

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