PHGY 209 Lecture Notes - Lecture 1: Diarrhea, Evaporation, Partial Pressure
14 Oct 2017
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Document Summary
Physiology: the study of the normal functional activities in the healthy living organism. > cell obtains: nutrients or o2 from environment (performs reactions to create energy) > cell eliminates: co2 + wastes to environment (uses energy) Unicellular organism: ex: amoeba gains the needed nutrients and o2 from pond water environment and releases wastes products back into water. Multicellular organism: each cell has its own internal environment surrounding it to make exchanges with. Claude bernard: milieu interieur the internal environment surrounding individual cells. Environment surrounding individual cells is vastly different from external environment. The internal milieu is vastly different in properties such as concentration, relative to the external environment. Internal environment remains relatively constant under conditions of health. Homeostasis: a state of dynamic constancy; state of reasonably stable balance between physiological variables (ex: blood pressure, body temperature, blood borne factors oxygen, glucose, sodium ions )
