what is the endocrine system
regulatory system composed of glands that secrete hormones
Functions
influences metabolism, growth, production and many other functions
endocrine system releases
hormones
what are hormones
chemical messenger released by endocrine glands to regulate activity of cells in other parts of body
what are circulating hormones
hormones which travel through bloodstream to target cells
which organ inactivates circulation hormones
liver
which organ excretes these hormones
kidneys
what are paracrine hormones
secreted into extracellular fluid to affect surrounding tissued - act on receptors on surrounding cells
what are autocrine hormones
act on the same cell that secreted them
what excretes histamine
white blood cells during allergic reaction
what do they do
stimulate vasodilation
how do water soluble circulate
within blood plasma
how do lipid soluble hormones circulate
they bind to transport proteins, which make them temporarily water soluble
where are the hormone receptors located
within the target cell or in the target cell membrane