GCSE Menstrual Cycle

The Pituitary gland releases FSH.

The Pituitary gland releases LH.

The Pituitary gland absorbs LH.

LH causes the egg to die.

FSH causes the egg follicle in the ovary mature and grow.

FSH causes the egg follicle in the oviduct mature and grow.

LH is released from the egg and it grows and matures.

Oestrogen is releases from the ovary and it grows and matures.

Oestrogen is released from the egg folicle and it grows further and matures.

Oestrogen makes the pituitary gland stop FSH and it starts releasing LH

Oestrogen makes the pituitary gland stop LH and it starts releasing FSH.

LH makes the pituitary gland stop oestrogen and it starts releasing FSH

The uterus thins.

The uterus thickens.

The uterus breaks down.

LH levels peak and the egg is released from the follicle.

FSH lowers and the egg is released from the follicle.

FSH levels peak and the egg is released from the follicle.

LH stops the oestrogen production.

FSH stops the LH production.

LH stops the FSH production.

Progesterone is released by the follicle, this maintains the uterus lining and stops LH.

Oestrogen is released by the follicle, this breaks down the uterus lining and stops LH.

FSH is released by the follicle, this maintains the uterus lining and stops LH.

If the egg is not fertilised levels of FSH fall.

If the egg is not fertilised levels of Oestrogen fall.

If the egg is not fertilised levels of progesterone fall.