KINESIOL 1AA3 Lecture Notes - Lecture 25: Anterior Pituitary, Blood Sugar, Extracellular Fluid
3 Apr 2016
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Circulating & local hormones: local hormones: act where they are secreted. Autocrine - act on same cell that secreted them. Paracrine - act on neighbouring cells: circulating hormones: cell releases hormone into the bloodstream. Sunday, april 3, y: growth & development, reproduction. Secrete products into ducts which empty into body cavities or body surface. Ex: pancreas releases pancreatic juice >> duct >> duodenum: endocrine glands. Secrete products (hormones) into bloodstream: pituitary, thyroid, parathyroid, adrenal, pineal. Other organs secrete hormones as a 2nd function: hypothalamus, thymus, pancreas, ovaries, testes, kidneys, stomach, liver, small intestine, skin, heart & placenta. Ex: pancreas releases insulin an glucagon into blood stream. Quickly diffuse out of capillaries: water soluble. Small or large, high solubility in aqueous fluids. Half-life: the length of time it takes for half a dose of a substance to be eliminated from the circulatory system. Long half-life: usually lipid soluble hormones (days/weeks) Short half-life: water-soluble hormones (mins/hours: communication.
