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Unformatted text preview: Protein and peptide hormones bind to receptors on the cell membrane and cause permeability changes or the production of a second messenger inside the cell. Lipid-soluble hormones, such as the steroids and thyroid hormones, enter the cell and bind to receptors inside the cell. The combining of hormones with their receptors results in a response. Regulation of Hormone Secretion The secretion of hormones is controlled by negative-feedback mechanisms. Secretion of hormones from a specific gland is controlled by blood levels of some chemical, another hormone, or nervous system. The endocrine system consists of ductless glands. Some glands of the endocrine system perform more than one function....
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- Fall '10