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| the maintenance of a steady state, such as a constant temperature, by means of physiological or behavioral feedback responses |
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| Quick signal through bloodstream to distant cells |
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| a chemical signal produced in minute amounts at one site in a multicellular organism and transported to another site where it acts on target cells |
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| Localized through ECM to nearby cells |
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| a chemical signal produced and released by neurons that subsequently acts as a hormone |
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| any of a family of lipids whose multiple rings share carbons; the steroid cholesterol is an important constituent of membranes; other steroids function as hormones |
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| a substance produced in and released by a neuron (the presynaptic cell) that diffuses across a synapse and excites or inhibits another cell (the postsynaptic cell) |
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| hacing no affinity for water; uncharged and nonpolar groups of atoms are hydrophobic |
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| having an affinity for water |
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| a regulatory protein made by immune system cells that affects other target cells in the immune system |
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| any one of a group of specialized lipids with hormone-like functions; it is not clear that they act at any considerable distance from the site of their production |
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| a small gland attached to the base of the brain in vertebrates; its hormones control the activities of other glands; aka hypophysis |
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| portion of the vertebrate pituitary gland that derives from gut epithelium and produces topic hormones |
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| a portion of the pituitary gland that is derived from neural tissue and is involved in the storage and release of antidiuretic hormone and oxytocin |
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| part of the brain lying below the thalamus; coordinates water balance, reproduction, temperature regulation, and metabolism |
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| hormones produced by the anterior pituitary that control the secretion of hormones by other endocrine glands |
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| in regulatory systems, information that decreases a regulatory response, returning the system to the set point |
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