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ch40[1] - PowerLecture Chapter 40 Respiration Section 40.0...

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PowerLecture: Chapter 40 Respiration Section 40.0: Weblinks and InfoTrac See the latest Weblinks and InfoTrac articles for this chapter online Videos: CNN Ask your Thomson Sales Representative for these volumes on CD or VHS Environmental Science, 2002, Vol. 5, Antismoking Campaign (2:13) Impacts, Issues: Up In Smoke In the US, about 3,000 teenagers take up smoking every day Just one cigarette immobilizes cilia that line airways of the lungs for hours, preventing them from sweeping away airborne pathogens and pollutants Impacts, Issues: Up In Smoke Filmy gunk from pathogens promotes: asthma attacks bronchitis colds Nicotine: constricts blood vessels raises blood pressure makes blood stickier and clots more likely Costs of smoking: clogged arteries heart attacks strokes Impacts, Issues: Up In Smoke Smoking increases the risk of deadly lung cancers Secondhand smoke causes about 3,000 lung cancer deaths each year Impacts, Issues Video Section 40.1: Weblinks and InfoTrac See the latest Weblinks and InfoTrac articles for this chapter online Respiration Physiological process by which oxygen moves into internal environment and carbon dioxide moves out Oxygen is needed for aerobic respiration Carbon dioxide is produced by same
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Respiratory System Acts in concert with the circulatory system to deliver oxygen and remove carbon dioxide Also helps regulate acid-base balance Pressure Gradients Concentration gradients for gases Gases diffuse down their pressure gradients Gases enter and leave the body by diffusing down pressure gradients across respiratory membranes Atmospheric Pressure Pressure exerted by the weight of the air on objects on Earth’s surface At sea level = 760 mm Hg Oxygen is 21% of air; its partial pressure is about 160 mm Hg Fick’s Law
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