4.21 Endocrine system- ActionOnline version endocrine system- Action by Jorge Arizpe 1 Endocrine cells release hormone 2 The hormone enters the blood and is carried throughout the body 3 The hormone leaves the capillaries and diffuses to all tissues through the intestinal fluid 4 The hormone affects cells bearing receptors to which the hormone can bind 5 The hormone cannot affect cells that only bear receptors to which the hormone cannot bind