BSC 2011 Lecture Notes - Lecture 19: Branchial Arch, Fick'S Laws Of Diffusion, Mass Diffusivity

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Keith Choe

Document Summary

Bsc2011 - integrated principles of biology 2 - lecture 3: breathing. Co2 is usually easier to eliminate than o2 is to obtain. You can drop your co2 level by hyperventilating causing the blood ph to rise and stopping the brain from functioning well. The concentration gradient of co2 from air-breathers to the environment is always large. Venous blood is about 5% co2 and the atmosphere is only 0. 03% co2. Co2 is more soluble and better at diffusion in water than o2. Co2 is easy for aquatic animals to exchange. Q: rate of diffusion between two points. D: diffusion coefficient, determined by the membrane material and temperature. L: distance between p1 and p2 (thickness of membrane) Evolution has selected for respiratory organs that maximize the product of the. Maximize partial pressure differences by ventilation of air or water and the perfusion of blood (p1-p2) Thin respiratory epithelial to minimize diffusion path length (l)