Biology 2601A/B Study Guide - Midterm Guide: Mass Diffusivity, Fetal Hemoglobin, Diffusion Equation
25 Nov 2016
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Diffusion in large animals (blue whale) vs. microscopic animals (rotifer) Exchange of o2 and co2 from the environment. Smaller animal - easy diffusion because of short distance. Diffusion alone is too slow to maintain the rates of gas exchange needed to support the metaboism of larger organisms. Bulk flow in multicellular organisms (example organism that looks like a weird sponge or something) Bulk flow of water over top of organism causes water to flow through ostium (pores) Oxygen diffuses out of seawater into cells. Partially deoxygenated water flows out of the top out ostium and out osculum. Percentages of o2 in the air and cold seawater. Factors that affect the amount of dissolved gases in solution. Get o2 from environment into cells, often via circulatory system. Air: about 21% is o2, as a gas. Cold seawater: about 0. 8% is o2, in solution. Amount of pressure that the gas of interest exerts.
