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Unformatted text preview: Chapter 18 (17 new): The respiratory system: Partial pressures and oxygen transport Opening screen: The body is voracious in its need for oxygen. The cells of the body We approximately W02 and Mme approximately 2mm at rest. To maintain homeostasis the body must obtain the 02 fiom the atmosphere and expel the C02 into the atmosphere. To provide the cells widt 02 an average adult male inhales 6000 mL of air per min, 4200 mL of that reaches the alveoli About 882 mL of this air (21%) is oxygen. About 250 mL of this oxygen diffuses from the alveoli to the blood for cell consumption. The remaining 632 ml. is exhaled. Dunnl nf“ WFOQW gmhhmpflflflmdmm maoxflelnmmdmhdmmm nflhMMWhh-lmdwfls Mmhmmmmmmmown Click the learning goals button: In this module we discuss how oxygen and carbon dioxide are exchanged efliciently between the alveoli and the blood and how the blood transports oxygen from the tissues. Click the Home Menu Button Click the Diffusion button: Under most conditions concentrations of oxygen and C02 in systemic arterial blood are maintained at relatively constant levels because oxygen movesfiom—alveolm—air—intedie-blood at the Wind by the tissues, and col moves into the alveolar air fi'om the blood at the same rate it is uced in the tissues. The ratio of the amount of C02 produced to the amount of oxygen consumed is called the respiratory quotient. Under resting conditions respiratory quotient is 0.8. Movement of C02 and 02 between alveolar air and blood occurs by difl’usion down their concentration gradient. G0 to the next screen: Now let’s take a look at how these gradients are established. Gradients are affected by the partial pressures and solubility of oxygen and C02. ...
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