BIOL 1080 Chapter Notes - Chapter 3: Cyclic Adenosine Monophosphate, Adrenal Gland, Thyroid

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Functions and mechanisms of hormones: the endocrine glands are made up of secretory cells that release hormones into the. Uid just outside the cells and into the bloodstream: major endocrine glands (major function includes releasing hormones): Pituitary, thyroid, adrenal, parathyroid, pineal: organs that have other functions but contain endocrine tissue: Hypothalamus, thymus, pancreas, ovaries, testes, heart, placenta, stomach, small intestine, and kidneys: endocrine system coordinates and regulates longer-term processes such as growth, development, and reproduction. Hormones as chemical messengers: target cells have receptors, protein molecules that recognize and bind to speci c hormones, lipid-soluble hormones: steroid hormones (hormones that are derived by a group closely related to cholesterol). Due to its lipid bilayer, lipid-soluble hormones can easily penetrate through the cell"s plasma membrane. Once inside, the hormone combines with receptor molecules in the cytoplasm. This hormone-receptor complex then movies to dna and activates certain genes which synthesize speci c proteins and/or enzymes that stimulate or inhibit particular metabolic pathways.

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