Transue-Lecture 10

Transue-Lecture 10 - Organismic respiration o The problem o...

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Organismic respiration o The problem o Systems for gas exchange Body surface Respiratory system Characteristics Mammalian system Earth’s Atmosphere Approximately 21% oxygen Gas 21% x 760 mmHg = 160 mm Hg (partial pressure) pCO2 = 0.3mmHg Air into alveoli o Oxygen = 160 mmHg o Co2 = 0.23 mmhg Blood into alveoli o Oxygen = 40 mmHg o CO2 = 45 mmHg Simple diffusion to get oxygen/carbon dioxide do not need to waste ATP Blood into Capillary o Oxygen = 100mmHg o CO2 = 40 m,Hg Tissue around capillary o Oxygen = <40mmHg o CO2 = >45 mmHg At equilibrium: Partial pressure in air = partial pressure in water Cold water = more oxygen, warm = more solute Fick’s law of Diffusion (p866) Amount of gas that diffuses: o Determined by differences in partial pressure Partial pressure in source vs. sink maintain high gradient o Amount of surface area o Optimal = theoretically maximize both but sometimes cannot occur Systems for gas exchange Organism surface
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Transue-Lecture 10 - Organismic respiration o The problem o...

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