topic 7 : animal coordordination control and homestasis Flashcards
what are hormones?
chemicals directly released into the blood.
what organs do hormones affect?
target organs
where are hormones produced and secreted?
endocrine glands
what does the pituitary gland produce
many hormons
what does the thyroid gland produce?
`thyroxine, which controls the rate of metabolism, heart rate and temperature
what does the adrenal gland produce?
adrenaline, which prepares us for fight or flight
what does the pancreas produce?
insulin, which is used to regulate blood glucose levels
what do the testes produce?
testosterone, sperm production and puberty
what do the ovaries produce?
oestrogen, menstrual cycle
differences between neurones and hormones
neurones- fast action, act for a short time, precise area. hormones- slower action, acts for a long time, general way.
what does adrenaline prepare you for?
fight or flight
what does adrenaline do?
binds to specific receptors in the heart; increases blood flow to muscles
binds to receptors in the liver; increases blood glucose levels
when does adrenaline get released?
in stressful situations
what does thyroxine do?
regulates metabolism
what does a negative feedback system do?
keeps the amount of thyroxine in the blood at the right level
