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less 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
follicular cells of the thyroid gland produce and secrete t and t in response to elevated levels of trh , produced by the hypothalamus , and subsequent elevated levels of tsh , produced by the anterior pituitary gland , which further regulates the metabolic activity and rate of all cells, including cell...
https://en.wikipedia.org/wiki/Endocrine_system