07ink - - P 2 L D: Use air!!!! for O 2 at 20C, D in water...

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Biology 182, 2009 Lecture 7, February 4 1 How cells respond to Thyroxin Immunocytochemistry to localize the T4 receptor These cells express the receptor (and thus are able to respond) These cells do not express receptor (and thus are unable to respond)
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Biology 182, 2009 Lecture 7, February 4 2 Immunocytochemistry on a thin section of tissue: black cells are labeled by antibody (express receptor), other cells are grey and unlabeled (do not express receptor) Rates of Diffusion
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Biology 182, 2009 Lecture 7, February 4 3 Diffusion J : net rate of diffusion (molecules per second per cross- sectional area) X: distance separating high (C1) from low (C2) concentration D: diffusion coefFcient What can an animal optimize? Q = DA P 1
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Unformatted text preview: - P 2 L D: Use air!!!! for O 2 at 20C, D in water is 200,000x LESS than D in air L: Make tissues in gills and lungs thin A: Maximize area of gas exchange P 1-P 2 Reduce boundary effects Ventilation Perfusion Use a sink for the gas Biology 182, 2009 Lecture 7, February 4 4 Rates of Diffusion Gill surface area Shark gill Dobson Fy larva gill Biology 182, 2009 Lecture 7, February 4 5 What is (ARE!) the respiration organ(s)? Gills 1 Biology 182, 2009 Lecture 7, February 4 6 Countercurrent exchange Bird Magic Biology 182, 2009 Lecture 7, February 4 7 Bird respiration, Sadava Figure 48.8 Do we understand this? Biology 182, 2009 Lecture 7, February 4 8 Hemoglobin Heme...
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07ink - - P 2 L D: Use air!!!! for O 2 at 20C, D in water...

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