Physiology 2130 Lecture Notes - Lecture 1: Genitourinary System, Extracellular Fluid, Blood Plasma
25 May 2016
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Document Summary
Physiology: the study of function in living organisms. Page 1 of 2: looks at mechanisms by which organisms control their internal environments regardless of their external environment, explains physical and chemical factors responsible for normal function and disease (pathology) Internal environment: fluid in which the cells of the body are bathed (interstitial fluid & blood plasma) External environment: outside the body; also includes the space and contents (not actual parts)of the digestive, respiratory, and urogenital tract. Homeostasis: maintenance of relatively stable conditions within the internal environment. Regardless of the external environment: homeostasis is achieved through positive and negative feedback control mechanisms. ** control variable (final product) shuts off its own production. Heat (controlled variable) is detected by the thermostat (sensor & control center) If set point is reached (20*c) then the thermostat shuts off furnace. ** control variable stimulates its own production; self-amplifying mechanism (control variable produced rapidly)
