PSL201 - Respiration.docx

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Department
Physiology
Course
PSL201Y1
Professor
Michelle French
Semester
Winter

Description
PSL201RespirationExchange of Oxygen and CO2in mixtures gases diffuse down their partial pressure gradientalveoli and blood are exchange pointsGas Exchang in the Lungsexchange of gases occur continuously between alveolar air and the capillary bloodupon inspiration fresh air enters and mixes with stale air in the deadspaceair in alveoli is saturated with water vaporblood in pulmonary capillaries is deoxygenated Po240 mmHg and Pco2 46mmHg o as it passes through alveoli both gases transport across their gradientseventually diffusion is reached and Pco2 40mmHg and Po2 100mmHgGas Exchange in Respiring Tissueblood flows back to left atrium via the pulmonary veinsthen pumped by the left ventricle Po2 100mmHg Pco2 40mmHgduring diffusion at tissues O2 moves into tissu
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