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Organismal Physiology Lecture No. 13.docx

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Biology 2601A/B
Tamsen Taylor

Organismal Physiology Lecture No. 13: Introduction To Gas Physiology Thursday October 25 , 2012 Oxygen & Physiology: -It is essential to receive oxygen for metabolism and exchange it with the environment. Along with CO , 2 oxygen is one of the respiratory gases. Oxygen On Earth: -The composition of “dry” gases (excluding water vapour) in the atmosphere include: about 20% O , 2 0.03% CO an2 78.09% N. 800 mya, oxygen levels were quite low and over time, there has been a rise in the levels of atmospheric oxygen. This has led to the eventual diversification of metazoans, seen most evidently in the Cambrian (approximately 503 mya). Thus, the rise of oxygen and the diversification of animals are definitely correlated (as animals increase in size, they will require a greater demand of oxygen in the environment). Introduction To Oxygen Physiology: -Animals do not actively transport O acro2s respiratory surfaces (no pumping of oxygen). Instead, the movement of O depe2ds on the rate of diffusion. As all cells need to be bathed in fluid to survive (including moist respiratory surfaces), it is necessary for O to 2irst dissolve in liquids and then diffuse across this liquid barrier. The respiratory surface that supplies gas exchange for the entire body of the animal is influenced by three factors: the animal’s s
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