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1.5 Gas Exchange
Unit D
Module 9 ~ Lesson 1
Gas Exchange
Gas exchange occurs as a result of a difference in the partial pressures of oxygen and carbon dioxide in different body regions.
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External respiration occurs at the lungs. Oxygen concentration (or partial pressure) is higher in the alveoli than it is in the blood of capillaries that surround the alveoli. As a result, oxygen moves from the alveoli to the blood. Conversely, carbon dioxide moves from the blood to the alveoli because its partial pressure is higher in blood.
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Inquiry into Biology (Whitby, ON: McGraw-Hill Ryerson, 2007), 252, fig. 7.7. Reproduced by permission.
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Read "Gas Exchange and External Respiration" on pages 250 to 254 of your textbook.