Biology 1001A Lecture Notes - Lecture 13: File Exchange Protocol, Partial Pressure, International System Of Units

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It is essential to receive oxygen for metabolism and exchange it with the environment. Along with co2, oxygen is one of the respiratory gases. The composition of dry gases (excluding water vapour) in the atmosphere include: about 20% o2, 0. 03% co2 and 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). Animals do not actively transport o2 across respiratory surfaces (no pumping of oxygen). Instead, the movement of o2 depends on the rate of diffusion.

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