Question

during the first two weeks of the human menstrual cycle artificially increasing blood levels of oestrogen and progesterone will​

Answer 1

Answer:

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Answer 2

1 - Inhibit ovulation by reducing the release of LH and FSH from pituitary gland.

Explanation:

The changes that occur during the menstrual cycle. The cycle is controlled by a number of hormones, the roles of which are as follows:

1) The pituitary gland secretes Follicle Stimulating Hormone (FSH), which stimulates follicle development.

2) Estrogen is then secreted by the follicle cells. An increase in oestrogen levels stimulates the thickening of the endometrium in the uterus. It also causes the pituitary gland to secrete Luteinizing hormone (LH), which causes ovulation.

3) The level of LH rises, which is followed by an increase in progesterone secretion, and the follicle develops into the corpus luteum.

4) The corpus luteum then secretes a high level of progesterone into the uterus, preparing it for implantation. FSH and LH levels are reduced when oestrogen and progesterone levels are high.

5) If no implantation occurs, progesterone and oestrogen levels fall, causing endometrium breakdown and the onset of menstruation.

6) Once menstruation begins, the level of FSH and LH rises again, signalling the start of a new menstrual cycle.

Thus, option 1 is correct