Hormones Flashcards
where are hormones released from and how do they travel?
endocrine gland
travel via blood plasma
what is the role of thyroxine?
regulate the rate that chemical reactions take place in the body while at rest
What happens if the thyroxine levels are too high?
hypothalamus measures level
TSH is stopped unitl levels go back to normal
what happens if the thyroxine levels are too low?
TSH released by pituitary gland
until normal
what is the role of adrenaline?
to prepare body for flight or fight response
Role of Follicle Stimulating Hormone (FSH)? and where is it produced and acted in where?
stimulates ovaries to develop follicle containing egg
released from pituitary gland
acts in the ovaries
Role of Oestrogen?
What is it produced by and what does it stop?
stimulates uterus lining to thicken
produced by ovaries
stops FSH and LH
What is the role of Leutinising Hormone (LH)?
produced where?
acts where?
stimulates the mature follicle to release egg around day 4
produced by pituitary glandd
acts in ovaries
Role of Progesterone?
secreted by?
what does it inhibit?
what happens when the levels of this fall?
maintains lining of uterus so egg can implant
secreted by empty follicle
inhibits LH
decrease in levels causes lining to break and menstruation
role of hormones in contraception?
high level of oestrogen and progesterone
oestrogen - can prevent FSH production and maturation of egg
progesterone - inhibits LH and produces mucus so sperm unable to fertilise
eg of hormonal contraceptives?
oral pills
skin patch
injection
iud
eg of non hormonal contraceptives?
condoms
iuds
avoiding sex
diaphragm
surgical methods
