Human hormones Flashcards
(24 cards)
how do hormones get transported in the endocrine system?
through the blood stream
role of pituatry gland
- master gland
- stimulates other glands
role of thyroid gland
- secrete thyroxine
- maintain metabollic rate
role of adrenal glands
- secrete adrenaline
- involved in fight or flight response
role of pancreas
- secrete insulin
- controll blood glucose levels
role of ovary
- secrete oestrogen
- secrete progesterone
name 4 effects of adrenalin being released
- increases heart rate
- increased blood flow
- dilate pupils
- increased blood glucose levels
In thyroxine negative feedback loop, what gland detects low thyroxine levels and in turn releases TRH?
hypothalamus
what does the release of TRH cause?
causes pituatry gland to release TSH
what does the release of TSH do?
acts of the thyroid gland so it releases thyroxine
what does the release of thyroxine do? (2)
- brings thyroxine levels back up
- thyroxine release inhibits TRH production
what does the hormone progesterone do?
maintains the uterus lining
what does the hormone oestrogen do?
stimulates uterus lining to grow
what does FSH do?
stimulate maturity in one of the eggs
what does LH do?
stimulate the release of mature egg on day 14
give the four stages of the menstrual cycle.
- menstruation, breaking down of uterus lining
- uterus lining thickens up again
- ovulation on day 14
- uterus lining is maintained
what does the release of FSH from pituatry gland do
- stimulate ovary to release oestrogen
- stimulate maturity in eggs
what does the release of oestrogen do
- inhibit FSH
- stimulate LH
- grows uterus lining
what does the release of LH do?
- stimulate growth of corpus luteum
- ovulation
what does the growth of corpus luteum do?
- release progesterone
what does the release of progesterone do?
- inhibit LH and FSH
- maintain uterus lining
what two hormones are used in hormonal CONTRACEPTION
- progesterone
- oestrogen
what two hormones are used to increase chance of ovulation and pregnancy?
- LH
- FSH
in contraceptive pill, why does progesterone prevent sperm entry?
because it stimulates growth of thick mucus in cervix
