Unit 2 - KA2 - Hormonal control of reproduction

FSH, LH, ICSH

What hormones does the pituitary gland release when stimulated?

a releaser hormone produced in the hypothalamus

What stimulates the pituitary gland to release hormones?

the onset of puberty

What is triggered by the pituitary gland releasing hormones?

sperm production

What does FSH promote in males?

testosterone

What does ICSH stimulate the production of?

stimulates sperm production and activates the prostate gland and seminal vesicles

What does testosterone do?

negative feedback control

What is the self-regulating mechanism called?

28 days

How long does the menstrual cycle last?

development of a follicle and the production of oestrogen by the follicle in the follicular phase

What does FSH stimulate in females?

the proliferation of the endometrium preparing it for implantation

What does oestrogen stimulate?

affects the consistency making it more easily penetrated by sperm

What does oestrogen do to cervical mucus?

a surge in secretion of LH

What do peak levels of oestrogen stimulate?

ovulation

What does surge of LH trigger?

release of an egg from a follicle in the ovary

What is ovulation?

around day 14

When does ovulation occur?

develops into a corpus luteum

What does the follicle do in the Luteal Phase?

progesterone

What hormone does the corpus luteum secrete?

further development and vascularisation of the endometrium preparing it for implantation if fertilisation occurs

What does progesterone promote?

prevents further follicles from developing

What does the negative feedback effect of the ovarian
hormones on the pituitary gland and the
secretion of FSH and LH do?

degeneration of the corpus luteum with a subsequent drop in progesterone levels leading to menstruation

What does the lack of LH lead to?

it does not degenerate and progesterone levels remain high

What happens to the corpus luteum if fertilisation occurs?