2.2 Flashcards
Female menstrual cycle , how long
Takes around 28 days
When does ovulation occur (day)
14 days into menstrual cycle
Two main phases of menstrual cycle
Follicular cycle (up to ovulation)
Luteal phase (ovulation to menstruation)
FSH stands for
Follicle Stimulating Hormone
LH stands for
Lutenising Hormone
What secretes FSH
Pituitary gland
What does FSH stimulate
Development of the follicle surrounding immature ova
Where is oestrogen produced
Ovary - Follicle
What does oestrogen stimulate
Growth of endometrium. High concentrations release LH
Where is LH produced
Pituitary gland
What does LH stimulate
Causes ovulation. Develops follicle bits into corpus luteum
Where is progesterone produced
Ovary - corpus luteum
What does progesterone stimulate
Causes more growth and vascularisation of endometrium. Higher concentrations inhibit LH and FSH.
What are hormones
Chemical messengers that travel in the blood
Releaser hormones in the hypothalamus activates two hormones in males ..
FSH - starts sperm production in seminiferous tubules
ICSH - causes interstitial cells to make testosterone
Releaser hormone in hypothalamus activates two hormones in females…
FSH - the ovaries produce follicles
LH - causes ovulation
What does ICSH stand for
Interstitial cell stimulating hormone
How does FSH act in males
Acts on seminiferous tubules to promote sperm production
How does ICSH act in males
Acts on interstitial cells to make them produce testosterone
How does testosterone act in males
Acts on seminiferous tubules to produce sperm
What does high levels of testosterone inhibit
High levels of testosterone inhibit production of FSH and ICSH in the pituitary
Explain the negative feedback of testosterone
High levels of testosterone inhibits FSH and ICSH
Testosterone production reduced due to lack of ICSH
