Respiratory System II

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Respiratory System II

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Lecture Note
University of Southern California
Bisc 307l - General Physiology
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BISC 307L 1st Edition Lecture 34 Current Lecture  Gas Exchange between Blood Air and Tissues o o gases only move by diffusion down their concentration gradients o There are no transport mechanisms for hem o The system is designed to create the gradients in the direction where the gas needs to go o Top: Alveolar Air (Reservoir of air)  Dry air 760 mmHg, PO2 – 150 mmHg PCo2 0.25  Alveolar air has less PO2 and higher PCO2 because we have a one way ventilation system  Have a lot of CO2 because the lung is getting rid of the CO2 into the alveolar air and that CO2 is mixing with incoming air so at the end of exhalation you have a lot of CO2 and then you inhale  The 100mmHG stays constant in the alveolar air for PO2 although the PCO2 changes from 40mmHg  Appears that maintenance of alveolar PO2 is the point of the whole system

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