MGTA02H3 Lecture Notes - Lecture 18: External Intercostal Muscles, Abdominal Cavity, Thoracic Vertebrae

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5 Sep 2016
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MGTA02H3 Full Course Notes
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Gasping is the most rudimentary method of obtaining air. Partial pressure of a gas: the pressure exerted by a given gas within a gas mixture. Composition of air: 79% nitrogen, 21% oxygen, 0. 03% carbon dioxide. Humans breathe to get rid of co2, not to get oxygen: opposite for fish; breathe to get oxygen, not to expel co2, at least from a controls system point of view. Air pressure is going to be the sum of the partial pressures of the gases in the atmosphere. Norm: normal levels, oxia oxygen, capnia carbon dioxide. Animals have a wide variety of respiratory organs. Oxygen diffuses 10000x faster in air than in water. Water breathers need to move more water over their gills than air breathers need to move air over their lungs in order to extract the same amount of oxygen. Water is 1000x more dense than air. Water is 50x more viscous than air. Gills for water breathing: external, internal.

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