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Lecture 16 Biology 2

Lecture 16 Biology 2 - Gas Exchange = Respiration I I I Why...

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Gas Exchange = Respiration I. Why do we need gas exchange systems? I. Surface Area to Volume (again!) II. Types of gas exchange systems I. Gas exchange in vertebrates III. Respiratory pigments IV. Pressure and respiration Respiratory Systems (also called Gas Exchange Systems) 1) Acquire oxygen 1) Needed for aerobic respiration of the monomers from digestion Æ 2) Dispose of… 3) May be important in vocalization Why need gas exchange? Exchange with the environment
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Respiration = Gas Exchange Why do we need gas exchange systems? 1) Total metabolism is proportional to body mass 1) 2) Body surface area increases with square of body length, but mass increases with the cube of body length. SA = 10 Volume=2 SA = 40 (4 x) Volume = 16 (8x) Ratio: SA:V 5 2.5 Respiration = Gas Exchange Why do we need gas exchange systems? 3) Therefore as animals get bigger, it is more difficult to acquire sufficient oxygen for the entire animal by diffusion from the exterior to the interior of the animal. 1) SA = 10 Volume=2 SA = 40 (4 x) Volume = 16 (8x) Respiration = Gas Exchange Why do we need gas exchange systems? 4) Respiratory gas exchange surface must scale with body volume instead of body length. In humans, the lung surface is…
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4 Types of Gas transfer mechanisms: 1) Body surface (diffusion only) 2) Gills (aquatic mostly) 3) Tracheal System (branched network) 4) Lungs 4 Types of Gas transfer mechanisms: 1) Body surface— oxygen and CO 2 diffuse in and out of cells 1)
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