chapter 16, Emily review Flashcards
hormones
long distance chemical signals that travel in blood or lymph
2 main classes of hormones:
1) amino acids
2) steroids
2 mechanisms of hormone action:
1) stimulate mitosis
2) induce secretory activity
all water-soluble hormones are ALL _________ EXCEPT:
amino based hormones
-thyroid hormone
lipid-soluble
act on intracellular receptors that directly activate genes
water soluble
bind to receptors through secondary messengers
up regulation
target cells form more receptors
down regulation
target cells lose receptors
permissivness
one hormone cant exert its effects its effects w/out another hormone being present
synergism
more than one hormone produces the same effect on a target cell (enhancing)
antagonism
one or more hormones opposes the action of another hormone (against)
humoral stimuli
fluids (blood) and calcium
neural stimuli
hypothalamus and pineal glands
hormonal stimuli
work together
anterior pituitary hormones are all ________ except _______
proteins, growth hormones