BIO 203 Lecture 22

BIO 203 Lecture 22 - Lecture 22 April 19, 2007 Respiration...

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Lecture 22 April 19, 2007 Respiration continued Respiratory volumes – review/learn it again Dead Space o Volume of air remaining in airways at the end of each exhalation o ~ 150mL per breath o Mixes with fresh air during inhalation Alveolar Ventilation o Volume of fresh air reaching alveoli per minute o Fresh air vol. x breaths per minute o Need to consider dead space, so fresh air volume = breath volume – dead space Partial pressure of a gas o Pressure due to a specific gas related to gas concentration o 21% composition of oxygen in the air, P O2 = .21 x 760 mm Hg = 160 mm Hg, P CO2 = .23 mm Hg Gases diffuse from region of high partial pressure to a region of low partial pressure Gas exchange occurs only in the capillaries, not in arteries or veins When airs from lungs in capillaries exchange goes there, goes to veins back to heart, to tissue, no change in the gas content between veins from lungs to the capillaries of the organ Because of hearts layers of epithelia, heart does not benefit from the oxygenated blood
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This note was uploaded on 04/08/2008 for the course BIO 328 taught by Professor Cabot during the Spring '07 term at SUNY Stony Brook.

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BIO 203 Lecture 22 - Lecture 22 April 19, 2007 Respiration...

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