PSL301H1 Lecture Notes - Lecture 16: Venous Blood, Partial Pressure, Carbamino
41
PSL301H1 Full Course Notes
Verified Note
41 documents
Document Summary
Air: nitrogen (78%), oxygen (21%), carbon dioxide (0. 03%) Total atmospheric pressure = 760 mm hg (100%: po2: 160 mm hg, pco2: 0. 2 mm hg, there are partial pressures of these gases in the air. Air is humidified: ph2o = 47 mm hg. [alveoli] 100 mm hg: ~60 mm hg lost in the alveoli. [venous blood] 40 mm hg: oxygen flow: lungs blood. [venous blood] 45 mm hg: carbon dioxide flow: blood lungs. Passive diffusion reaches equilibrium: po2= 100 mm hg, pco2 = 40 mm hg. Gradient of partial pressures necessary to maintaining movement exchange. Oxygen highest in the airways (compared to any & all tissues in the body: as it is inhaled in passing different tisuses, oxygen diffuses through to tissues, b/c of passive diffusion created by concentration gradient. Carbon dioxide reverse: lowest partial pressures of carbon dioxide in the inhaled air, carbon dioxide in the body diffuse out to the lungs. Carbon dioxide flow @ tissues: tissues blood.
