Bio_1A_Lecture_17_Respiration

Bio_1A_Lecture_17_Respiration - O2 A tm o s p h e re O2 CO2...

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O 2 CO 2 Atmosphere O 2 CO 2
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Very small animals can exchange gas without a specialized respiratory apparatus
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How fast is DIFFUSION? What is DIFFUSION? Diffusion distance Time required for diffusion 1-10 µ m 1 mm - 1 cm 1-50 msec 10 min - 10 hr start equilibrium CONCLUSION? intermediate DIFFUSION is fast at small distances and slow at long distances
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Fick's Law of Diffusion Rate of diffusion = R = D x A x D = the diffusion coefficient C = concentration of the substance A = area available for diffusion x = the distance for the diffusion Rate of Diffusion Distance Area x Concentration What is the strategy in the evolution of the respiratory apparatus? available surface area distance required for diffusion dC dx Adolf Fick
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So……. . the strategy is to increase the surface area and decrease the distance that has to be accommodated for diffusion of gases from the atmosphere (in this case sea water) and the body fluid. Echinoderms
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This note was uploaded on 10/29/2009 for the course BIO biology taught by Professor Meighan during the Fall '09 term at University of California, Berkeley.

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Bio_1A_Lecture_17_Respiration - O2 A tm o s p h e re O2 CO2...

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