26Ch42gasexchange2005a - alveoli Chapter 42. Gas Exchange...

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2005-2006 AP Biology Chapter 42. Gas Exchange gills alveoli elephant seals
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2005-2006 AP Biology
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2005-2006 AP Biology Gas exchange O 2 & CO 2 exchange exchange between environment & cells provides O 2 for aerobic cellular respiration need moist membrane need high surface area Respiration for respiration!
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2005-2006 AP Biology Optimizing gas exchange Why high surface area? maximizing rate of gas exchange CO 2 & O 2 move across cell membrane by diffusion rate of diffusion proportional to surface area Why moist membranes? moisture maintains cell membrane structure gases diffuse only dissolved in water
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2005-2006 AP Biology Gas exchange in many forms… one-celled amphibians echinoderms insects fish mammals endotherm vs. ectotherm water vs. land
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2005-2006 AP Biology Evolution of gas exchange structures external systems with lots of surface area exposed to aquatic environment Aquatic organisms moist internal respiratory surfaces with lots of surface area Terrestrial
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2005-2006 AP Biology Gas Exchange in Water: Gills
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2005-2006 AP Biology Function of gills out-foldings of body surface suspended in water Just keep swimming…
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2005-2006 Counter current exchange system Water carrying gas flows in one direction, blood flows in opposite direction What is the adaptive value?
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2005-2006 AP Biology water blood How counter current exchange works Blood & water flow in opposite directions
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This note was uploaded on 01/22/2012 for the course 2341 13314 taught by Professor Camus during the Spring '11 term at Central Luzon State University.

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26Ch42gasexchange2005a - alveoli Chapter 42. Gas Exchange...

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