BSC 109 Lecture 18: BSC 109 Chapter 10 Part 2

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Lung volumes and vital capacity measure lung function. Volume of air that can be inhaled beyond the tidal volume. Volume of air that can be forcibly exhaled beyond the tidal volume. Volume of air remaining in the lungs, even after a forceful maximal expiration. Partial pressure: the pressure exerted by one particular gas in a mixture of gases. Partial pressure of a gas is proportional to its percentage of the total gas composition. A gas always diffuses down its partial pressure gradient, from higher to lower partial pressure. External respiration: the exchange of gases between air and blood. O2 diffuses from alveoli (po2: 104 mmhg) into blood (po2: 40 mmhg), down its partial pressure gradient. Co2 diffuses from blood (pco2: 46 mmhg) into alveoli (pco2: 40 mmhg), down its partial pressure gradient. Internal respiration: the exchange of gases with tissue fluids. O2 diffuses down its pressure gradient from capillaries to interstitial fluid and then to cells.

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