BPK 205 Lecture 26: Gas Composition and Exchange

30 views4 pages

Document Summary

Lecture 26 gas composition and gas exchange. In humid air -> patm = pn2 + po2 + pco2 + ph2o. Dalton"s law of partial pressures: the total pressure in a gas mixture is the sum of the partial pressures of each individual gas. In dry air -> pgas = patm x % of gas in atmosphere. In humid air -> pgas = (patm ph2o) x % of gas in atmosphere. Gas composition in the alveoli: as alveolar ventilation increases, alveolar po2 increases and pco2 decreases, the opposite occurs as alveolar ventilation decreases. In the atmosphere: po2 = 160 mmhg, pco2 = 0. 25 mmhg. 2: alveolar partial pressures remain relatively constant during quiet breathing, po2 = 100 mmhg, pco2 = 40 mmhg, can vary with hypo or hyperventilation (shown in graph, **know these values** O2 and co2 diffuse across alveolar epithelial cells and capillary endothelial cells. 3: anaerobic metabolism consumes o2 and produces co2.

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

Related Questions