![]() Amine hormones originate from the amino acids tryptophan or tyrosine. Hormones are derived from amino acids or lipids. Many organs of the body with other primary functions-such as the heart, stomach, and kidneys-also have hormone-secreting cells. Endocrine glands are ductless glands that secrete hormones. From there, hormones diffuse into the bloodstream and may travel to distant body regions, where they elicit a response in target cells. ![]() Endocrine communication involves chemical signaling via the release of hormones into the extracellular fluid. ![]() Neural communication includes both electrical and chemical signaling between neurons and target cells. ![]() The body coordinates its functions through two major types of communication: neural and endocrine. The endocrine system consists of cells, tissues, and organs that secrete hormones critical to homeostasis. ![]()
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