01:119:116 Lecture Notes - Lecture 27: Cough Reflex, Thoracic Cavity, Pharynx
23 Apr 2016
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Document Summary
Gas exchange supplies o2 for cellular respiration and disposes co2. Aerobic cellular respiration occurs in mitochondria. Organismic respiration gas exchange between organism and environment. O2 taken from environment and transported to cells. Co2 taken away from cells and released into environment. Partial pressure = pressure exerted by a particular gas in a mixture of gases also apply to gases dissolved in liquids such as water. If you have the p that the gas mixture exerts (ex. atmospheric p at sea level is patm = 760 mmhg. And the fraction of mixture represented by the particular gas (ex. there is. Then the partial pressure of o2 in atm po2 = 0. 21 x 760 = 160 mmhg. Gases undergo net diffusion from a region of higher partial pressure to a region of lower partial pressure. O2 moves from high pos to low po2. Works because cell membrane of almost every cell is in contact with environment.
