BIOL 1030 Chapter Notes - Chapter 45: Anterior Pituitary, Tropic Hormone, Mammary Gland
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BIOL 1030 Full Course Notes
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Lipid-soluble hormones have intracellular receptors: evidence for intracellular receptors for steroid hormones came in the. Intracellular receptors usually perform the entire task of transducing the signal within the target cell: the chemical signal activates the receptor, which directly triggers the cell"s response. Its major tropic action is to signal the liver to release insulin-like growth factors (igfs), which circulate in the blood and directly stimulate bone and cartilage growth. Concept 45. 4 nonpituitary hormones help regulate metabolism, homeostasis, development, and behavior. In addition to cells that produce t3 and t4, the mammalian thyroid gland produces calcitonin: this hormone acts in conjunction with parathyroid hormone to maintain calcium homeostasis. Parathyroid hormone and calcitonin balance blood calcium: rigorous homeostatic control of blood calcium level is critical because calcium ions (ca2+) are essential to the normal functioning of all cells. If blood ca2+ falls substantially, skeletal muscles begin to contract convulsively, a potentially fatal condition called tetany.