PHGY 214 Chapter : PHGY 214 - Homeostasis + Nervous System (CH 1, CH 3) .pdf

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Homeostasis: ability of a cell/organism to regulate internal conditions (ex: ph) using feedback systems to minimize variation and maintain health only in response to the. There is no set point in homeostasis, more of a set range (eg. body temp btwn 36-37)! Homeokinesis: suggests the organism will achieve equilibrium in body functions by continuous change. (conditions are continuously changing ex: breathing, heart rate, blood pressure) ! In healthy lungs, control of airway calibre is homeokinetic! The difference: homeostasis responds to change in internal environment while homeokinesis initiates it. extracellular uid (ecf). Interstitial uid: surrounds and bathes the cell! and the external environment ! Since most cells do not have access to the external environment (like say, a single celled amoeba would have), they rely on the watery internal environment to make exchanges! Fluid contained in body cells is intracellular uid (icf). The ecf is the internal environment of the body (inside the body but outside of each cell)!

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