Chapter 29

Chapter 29 - 03/03/08 Chapter 29: Respiration Cellular...

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03/03/08 Chapter 29: Respiration Cellular Respiration: 1. Done by mitochondria 2. Requires oxygen 3. Generates carbon dioxide as a waste 4. ATP (energy) generated during this process Respiratory System: 1. Requires large, moist surface area 2. 3. Exchange of O2 and CO2 4. Gases dissolve in moisture easier, then exchange Evolution of respiratory systems: 1. No respiratory or circulatory system a. Small, thin animals in moist environments (nematodes or flatworms; large, moist external surface area for gas exchange) i. Marine flatworm- only a few layers thick of cells ii. Jellyfish- light passes through them no blood, no respiratory system iii. Sponges- very porous 2. Circulatory but no respiratory system a. Earthworms have well developed, closed circulatory systems to carry gases throughout their bodies. Still rely on diffusion in/out of circulatory system through moist skin surface. i. Earthworm
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3. Respiratory and circulatory systems a. Don’t need moist exterior, but surface where gas exchange occurs (lungs)
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Chapter 29 - 03/03/08 Chapter 29: Respiration Cellular...

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