December 4-ch33 - December 4, 2007 Chapter 33 Respiratory...

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December 4, 2007 Chapter 33 Respiratory system Why Exchange Gases? Gas exchange supports cellular respiration Gas exchange in vertebrates o O2 is inhaled into lungs, deposited in blood, and transported by red blood cells o Used in cellular respiration o Blood transports CO2 from tissues to lungs o CO2 released from lungs during exhalation Common respiratory features Three features o Respiratory surface must be moist o Cells lining respiratory are thin o Respiratory surface area must be large Gas exchange Respiratory systems facilitate more effective exchange of gases Respiratory systems alternate bulk flow of air/water and diffusion of gases In mammals o Air or water moves past respiratory surface by bulk flow (down pressure gradient) o O2 and CO2 are exchanged by diffusion o Gases transported to/from tissues by bulk flow o Gases exchanged with tissues by diffusion Skip pages 672-674 Lungs Lungs are internal chambers containing moist respiratory surfaces o Used by most terrestrial vertebrates
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This note was uploaded on 04/10/2008 for the course BIOLOGY 101 taught by Professor Beitch during the Spring '07 term at Quinnipiac.

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December 4-ch33 - December 4, 2007 Chapter 33 Respiratory...

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