Study Guide for Chapter 48 con't

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Biological Sciences
Mary Olaveson

Chapter 48 Gas Exchange in Animals [email protected] Pw- -Respiratory gases: oxygen and carbon dioxide -Diffusion- is the only method of exchanging gases through internal body fluids - random motion of molecules( area of high [C] to an area of low [C]) -No means of active transport necessary to transport gases cross biological membranes Ficks Law of Diffusion- describes the rate at which a substance will diffuse through a concentration gradient. Q = DA (P -P 1 2 L) - Q = the rate at which a gas such as oxygen diffuses between two locations - D = is the diffusion coefficient, which is a characteristic of the diffusion substance, the medium and temp - A = is the cross-sectional area through which the gas is diffusing - P1and P =2are the partial pressures of the gas at the two locations - L = is the path length, or distance between the two locations. -Air is a better respiratory medium than water so oxygen can be obtained more easily than water for these reasons: - The oxygen content of air is much higher than the oxygen content of an equal volume of water - Oxygen diffuses about 8000 times more rapidly in air than in water - More energy is required to move water than to move air because water
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