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hormones such as erythropoietin and renin . hormones can consist of either amino acid complexes, steroids , eicosanoids , leukotrienes , or prostaglandins . [ ] the endocrine system can be contrasted to both exocrine glands , which secrete hormones to the outside of the body using ducts and paracrine signalling
vascular and have ducts or a hollow lumen . the word endocrine derives via new latin from the greek words ἔνδον , endon, "inside, within," and "crine" from the κρίνω , krīnō, "to separate, distinguish". contents structure major endocrine systems glands cells development function hormones cell signalling...
https://en.wikipedia.org/wiki/Endocrine_system