Menstrual Cycle (4)

Biology

Question

Menstrual Cycle (4)

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Stages of events in menstrual cycle during day 0-5 (6)

Within the primary follicle, the oocyte grows into the secondary oocyte, which is contained within the Graafian follicle

Stages of events in menstrual cycle during day 0-5 (7)

Growing follicles release oestrogen

Stages of events in menstrual cycle during day 0-5 (8)

Oestrogen encourages follicle maturation and also encourages endometrial wall repair

Stages of events in menstrual cycle during day 0-5 (9)

Low levels of oestrogen inhibit the release of FSH and LH via a negative feedback mechanism, which in turn prevents the growth of new follicles

Stages of events in menstrual cycle during day 6-14 (1)

Oestrogen level rises and peaks on day 12, stimulating the hypothalamus to secrete GnRH via a positive feedback mechanism

Stages of events in menstrual cycle during day 6-14 (2)

A high level of GnRH then stimulates the pituitary gland to secrete more FSH and LH

Stages of events in menstrual cycle during day 6-14 (3)

The LH level rises until it peaks on day 13, leading to ovulation and release of a secondary oocyte from Graafian follicle on day 14

Stages of events in menstrual cycle during day 6-14 (4)

LH also stimulates the follicular tissue left behind to transform into the corpus luteum

Stages of events in menstrual cycle during day 15-21 (1)

LH stimulates the corpus luteum to secrete oestrogen and progesterone

Stages of events in menstrual cycle during day 15-21 (2)

The combination of oestrogen and progesterone inhibits the release of FSH and LH from the hypothalamus via negative-feedback mechanism so as to stop the growth of new follicles

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Menstrual Cycle (4)

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