BIO 121 Lecture Notes - Lecture 19: Metabolite, Hypercapnia, Partial Pressure
24 Jul 2020
School
Department
Course
Professor
Document Summary
Physiological respiration gas exchange (mainly o2 & co2) b/n ambient medium & body fluids. Cellular respiration metabolic process that results in conversion of o2 to co2. Hypercapnia = excessive high co2 levels in blood. Partial pressure = component of total pressure contributed by single gas within gas mixture. O2 diffusion rate b/n air & body fluids depends on diff b/n partial pressures. Air is better respiratory medium than water o2 diffuses more rapidly in air than water. Diffusion = only way respiratory gases are exchanged b/n internal body fluids & outside medium of animal: hence conc gradient v. important. Diffusional transport extremely slow over large distances. Small animals don"t need respiratory organs b/c can take up o2 directly from enviro. thru body surface diffuses o2 throughout body, into cells & throughout cytoplasm. Larger/complex animals cannot rely on simple diffusion b/c: high cellular metabolic rate, body v. large & not high tsa:v.
