BIO 126 Lecture 10: Endocrine Systems Ch 50 copy
21 Mar 2016
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Types of hormones and their mechanisms of action. Nervous and endocrine systems are both for communication. Hormone receptors and mode of action: hormones are chemicals that stimulate only those cells that have receptors for them. On plasma membrane, in the cytoplasm, or in the nucleus: receptors act like switches turning on metabolic pathways when hormone binds to them. Hormone - a chemical that is secreted from an endocrine gland/tissue/cell into the body fluids (typically the bloodstream) which has an effect on some target cell or effector. Target cells or effectors will respond to the hormone only if it has a receptor specific for that hormone (ie. insulin binds to insulin receptors: it is an analogous system to neurotransmitters and their specific receptors. The vertebrate endocrine system: general functions. Regulation of mineral (water and electrolyte) balance. Must use receptors on the cell surface: proteins/peptides. Must use receptors on the cell surface: steroids. Less soluble in water require carriers.
