Unit 2 KA2 - Hormonal Control if Reproduction
What in the brain begins to secrete a releaser hormome?
The hypothalamus gland
What does the releaser hormone target?
The pituitary gland
What two hormones are released when the releaser hormone stimulates the pituitary gland?
FSH
ICSH/LH
What does the release of these hormones trigger?
The onset of puberty
Pituitary gland hormones (females)
FSH
LH
Pituitary gland hormones (male)
FSH
ICSH
what does FSH promote?
Sperm production
what does ICSH produce?
testosterone
What else stimublates sperm production?
Testosterone
What does testosterone activate during sperm production?
The prostate gland and seminal vesicles.
How long does the menstrual cycle last?
about 28 days
The first day of the menstrual cycle is the first day of...
menstruation
FSH stimulates the development of a...
follicle and the production of oestregen by the follicle in tje follicular phase
What does Oestregen stimulate?
Proliferation of the endometrium preparing it for implantation.
What does the consistency of the cervical mucus mean?
It makes it more easily penetrable by sperm
Peak levels of oestregen stimulate a surge in the secretion of...
LH
What does a surge in LH trigger?
Ovulation
What is ovulation
the release of an egg from a follicle in the ovary
When does ovulation occur
At the midpoint of the menstrual cycle
What happens in the luteal phase?
The follicle develops into a corpus luteum secretes progesterone
What does progesterone promote?
Further development and vascularisation of the endometrium preparing it for implantation if fertilisation occurs
What is the negative feedback effect kfcthe ovarian hormones on the pituitary gland and the secretion of FSH and LH?
It prevents further follicles from developing
What does a lack of LH lead to? (negative feedback)
The degeneration of the corpus luteum with a subsequent drop in progesterone levels leading to menstruation
What happens to the corpus luteum if fertilisation does't occur?
It doesnt degenerate and progesterone levels remain high