BSCI 207 Lecture Notes - Lecture 23: Acidosis, Lung, Cellular Respiration
31 Oct 2016
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Document Summary
Numerous implications exist for gas exchange for large organisms. Diffusion is only efficient for small organisms. Gas transport in animals: large organisms need to be flat or highly branched for surface area to scale linearly with volume. If that cannot occur, large organisms need lungs, carrier proteins, Water solubility is another limitation to gas exchange circulatory system etc: warm liquids hold less gas, gas solubility of different gasses varies greatly at a given temperature, consequences for blood: Aerobic respiration requires an equal influx and efflux of oxygen and carbon dioxide to maintain a steady state. Oxygen is less soluble than carbon dioxide. Oxygen binds to each of the four heme groups present in hemoglobin. Carbon dioxide binds to the protein part of the hemoglobin (not as high as an affinity) Partial pressure and its associated laws is what drives gas diffusion. Partial pressure = the total pressure that is attributable to one constituent of a gas mixture.
