BIOB34H3 Lecture Notes - Rib Cage, Blood Vessel, Hematocrit
Document Summary
Bulk flow: disadvantages of alveolar lungs, entire system is wet, at low lung volume, water mols on walls will be attracted to each other and this makes reinflation of the lungs difficult. Air animals breathing has po2 of 166 ml of mercury, gets lower with height: residual air elft in lungs has lower po2 value bc it has already had gas exchange. Its like 50 ml: when breathe in, fresh air is being mixed with deoxygenated air, they mix and we dilute oxygen content of air bc its mixed. Increase sa or reduce oxyegn demand: reduce o2 demand, size and oxygen demand rate. If uh hve large external surface atre from which water could evaporate: cause water loss. If they lined with water then they attrcated and theres space wher e gas can pass. If no water then no attraction so they itneract with each other an dprevent diffusion: fluid can build up within alveoli- pulmonaery edma.
