15.5 Human Structure and Function

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5 Terms

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Three factors determining degree of cell activation

Blood levels of hormone, number of receptors for hormone, Affinity of binding between receptor and hormone

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Receptor protien

Binds to a hormone to activate target cell

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Adrenocorticotropic (ACTH)

receptor protein in adrenal cortex cells

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Up-regulation

low concentration of a hormone causes target cells to form additional receptors

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Down-regulation

high hormone concentrations decreases the number of receptors