Week 5, Lecture 3, Gas Exchange

Week 5, Lecture 3, Gas Exchange - Gas Exchange Composition...

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Gas Exchange Composition of air Diffusion of gases Problems faced by organisms Unicellular vs Multicellular Aquatic vs Terrestrial Plants Animals Composition Diffusion Problems Composition of air Percent composition remains constant regardless of atmospheric pressure. Composition Diffusion Problems Nitrogen N 2 78% Oxygen O 2 21% Carbon dioxide CO 2 0.03% Other gases argon, etc 0.97% Composition of air At Sea Level barometric pressure = 760 mm Hg. Partial pressure of O 2 = 21% of 760 mm = 160 mm At 6,000 m barometric pressure = 380 mm Hg. Partial pressure of O 2 = 21% of 380 mm = 80 mm Composition Diffusion Problems Solubility in water 1) Atmospheric pressure - greater the atmospheric pressure, more gases dissolved in water. 2) Temperature - higher the temperature, the less soluble are gases in water 3) Salinity - greater the salinity, less soluble are gases in water 4) Molecular size and structure - solubility changes with structure; CO 2 is 30x more soluble than O 2 in water (% changes)
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Week 5, Lecture 3, Gas Exchange - Gas Exchange Composition...

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