BIO 3302 Lecture Notes - Lecture 7: Tidal Volume, Gie, Pleural Cavity
2 Nov 2016
School
Department
Course
Professor
Document Summary
Integument: gills = invaginated extension of body surface, lungs = invaginated, internalised gas exchange surface. Common design features: large sa, thin epithelium, high permeability - for gases, richly vascularized - lots of blood vessels, typically ventilated. Why do these appear in most organisms. Mo2 = po2 ko2 sa/t: mo2 = v(cid:373) [o2] , m = medium, i. e. air or water, [o2] = mo2 po2. O2 much less soluble in water than in air - water is much more o2 deficient. Animals that live in water have much less o2 in respiratory medium than in air. Maintain o2 uptake = pump more water over gas exchange surface than air breathers. Depends on vm, flow of medium, has to be much higher for air breather (10-20x) for water breathers to achieve the same as air breathers. Water holds much less o2 than blood - physically dissolved o2 is low vs the blood.
