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CHAPTER 33 RESPIRATION

CHAPTER 33 RESPIRATION - CHAPTER 33 RESPIRATION Cellular...

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November 16, 2011 CHAPTER 33 RESPIRATION Cellular Respiration Mitochondria need sugars like glucose and they need oxygen to make ATP. You have mitochondria in each one of your eukaryotic cells. Cells use that ATP to stay alive. Cellular respiration is done by mitochondria. Every single cell in your body is doing cellular respiration. Cellular respiration requires oxygen. Cellular respiration generates carbon dioxide as a waste. ATP (energy) is generated during cellular respiration. ATP is made from ADP by your body. Prokaryotes do not have mitochondria but they still respire. Respiratory System Respiratory system requires large, moist surface area. (Animals that respire) This is where the blood and the external environment interact. o Our external environment is the air. Exchange of O 2 and CO 2 That large moist surface area is required so that gases dissolve in moisture easier, then exchange. Evolution of respiratory systems Not all animals have a respiratory system and not all animals have a circulatory system. No respiratory or circulatory system o These animals lack the tube system that allows this system to work. o Small, thin animals in moist environments (nematodes or flatworms; large, moist external surface area for gas exchange) o To be able to rely on diffusion they have to be really thin animals and they most have a huge surface area compared to its volume. o Example: Marine flatworm Its body is about the thickness of a piece of paper. Oxygen flows to the body of the worm because oxygen moves from areas of high concentration to low concentration.
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