intro to steroid hormones Flashcards
define a hormone
a substance that is produced in one tissue or organ, released into the blood and carried to other organs where it acts to produce a specific response
what are the systems by which we classify hormones
-by proximity of their site of synthesis to their site of action
-chemical structure
-solubility
endocrine hormones
synthesized by glands and transported by the blood to their target cells
paracrine hormones
synthesized near their targets of action
autocrine hormones
synthesis and action in the same cell
bind to membrane receptors, trigger intracellular signaling cascade to regulate cell function
hydrophilic hormones
bind to intracellular receptors, either in the cytoplasm or in the nucleus, to regulate cell function
lipophilic hormones