Physiology 2130 Chapter Notes - Chapter 1: Extracellular Fluid, Blood Plasma, Body Fluid
16 Sep 2016
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Document Summary
Physiology: study of function in living organisms: explores how organisms control their internal environments regardless of what happens in the external environment, explains physical and chemical factors responsible for both normal function and disease. Internal environment: fluid in which the cells of our body are bathed: consists of interstitial fluid and blood plasma. External environment: region outside the body: space and contents of the digestive, respiratory and urogenital tracts. All negative feedback control systems operate the same way to maintain homeostasis from maintaining body temperatures to body fluid volumes. They contain: set point, control center (integrator, effector, controlled variable, sensor (receptor) Sensors detect rise in temperature and signal the hypothalamus and the hypothalamus utilizes the nervous system and signals blood vessels in the skin to dilate and sweat glands to sweat. Heat dissipates and body temperature would be normal. Negative feedback: the controlled variable eventually shuts off its own production.
