Biology 2601A/B Lecture Notes - Gas Exchange, Partial Pressure, Fick'S Laws Of Diffusion
16 Oct 2011
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Gas exchange 1: principles & animals breathing in water. In general, it is important to note that metabolism and photosynthesis are dependent on o and. Involves getting o out of the external medium and into the cells: this is often done via the circulatory system. Also involves getting co out of the cells and into the external medium. Getting co out of the external medium and into the cells: usually via diffusion or stomata. Getting o out of the cells and into the external medium: or can also be used in respiration. Remember: water vapour is also a gas (important when considering water loss in plants) Although this lecture discusses o , the principles also apply to co and water vapour. Most of the o is in the air rather than in water: cold sea water: approximately 0. 8% o in solution, air: approximately 21% o as a gas.
