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Physiology 1021
Beth Mac Dougall- Shackleton

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MODULE 1: INTRO TO PHYSIOLOGY Internal & External Environments  Physiology: the study of function in living organisms; explores mechanisms organisms use to control their internal environments regardless of the outside (external) environment; explains physical and chemical factors responsible for normal function and disease (pathology)  Homeostasis: the maintenance of relatively constant conditions in the internal environment (despite a variable external environment); maintaining tis internal environment requires almost all the organ systems in the body o Internal environment: the fluid in which the cell’s of the body bathe (essentially the interstitial fluid and blood plasma); this does not include the cells o External environment: region outside of body (includes space and contents of digestive, respiratory and urogenital tracts) o Body maintains homeostasis using negative and positive feedback control systems  Negative Feedback (& p
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