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Test 5- Outline+4c

Test 5- Outline+4c - NOTES FOR BIOLOGY 1002 SECTIONS 001...

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NOTES FOR BIOLOGY 1002 SECTIONS 001 and 002 Spring 2008 DR. STEVEN POMARICO Outline 4C CHAPTER 29 Respiration The process cellular respiration in organisms (what the mitochondria do) requires O 2 and generates CO 2 as a waste product Because this cellular respiration is where animals generate most of their ATP (energy) it’s important to keep this process going. In order to keep the supply of O 2 flowing to the cells and remove the CO 2 waste respiration is required. In most animals, the O 2 and CO 2 are transported in the blood by bulk flow and exchange into and out of the cells by diffusion. Gas exchange between blood and external environment (air or water) also occurs by diffusion. The respiratory system provides a large, moist surface area so that blood and the external environment may be exchange O 2 and CO 2 by diffusion.
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The Evolution of Respiratory Systems 1. Respiration without a respiratory or circulatory system (see fig 29-1). Respiration without specialized respiratory structures occurs in small, thin animals in moist environments. (Example: nematodes or flatworms, each have a relatively large, moist external surface area for gas exchange) 2. Respiration without a respiratory system but with a circulatory system Earthworms have well-developed closed circulatory systems to carry gases throughout their bodies but still rely on gas exchange by diffusion in and out of the circulatory system through the moist skin surface.
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