01:119:115 Lecture 27: Biology- Lecture 27 (Respiration - Chapter 42.5 & 42.7)
13 Jul 2016
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Gas exchange supplies o2 for cellular respiration and disposes of co2. Organismic respiration gas exchange between organism and environment. O2 taken from environment & transported to cells. Co2 taken away from cells and released into environment: partial pressure gradients in gas exchange. Partial pressure = pressure exerted by a particular gas in a mixture of gases also apply to gases dissolved in liquids such as water: calculating partial pressure (need to know) If you have the pressure that the gas mixture exerts. Example: atmospheric pressure at sea level is: patm = 760 mm hg. And the fraction of mixture represented by the particular gas: example: there is 21% o2 in atmosphere. Then the partial pressure of o2 in atm po2 = 0. 21 x 760 = ~ 160 mm hg: movements of gas. Gases undergo net diffusion from a region of higher partial pressure to a region of lower partial pressure.
