BI SC 004 Lecture Notes - Lecture 49: Tuberculosis, Extracellular Fluid, Sinusitis

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26 Mar 2017
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The exchange of gases is dependent on diffusion. Partial pressure is: the amount of pressure each gas exerts. O2 and co2 will diffuse from the area of higher partial pressure, to the area of lower partial pressure. There are 2 types of respiration that occur in the body. External respiration: exchange of gases in the lungs. Internal respiration: exchange of gases in the tissues. Exchange of gases between alveoli in the lung, and the pulmonary blood capillaries. Pco2 is higher in the lung capillaries than the air: thus: The partial pressure pattern for o2 is just the opposite, so o2 diffuses: from the alveoli, into the lung capillaries. The exchange of gases between the blood in the capillaries outside of the: lungs, tissue fluid. P02 is higher in the capillaries than the tissue fluid, thus o2 diffuses: out of the blood, into the tissues.

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