BIOA02H3 Lecture 6: lec 6

• School: UTSC
• Department: Biological Sciences
• Course: BIOA02H3
• Professor: Ivana Stehlik

Document Summary

= 0. 7904 (760) = 601mmhg: hypoxia: decreased inspired o2 (pio2, hyperoxia: increased inspired o2, normoxia: normal inspired o2, hypercapnia: increased inspired co2 (pico2, hypocapnia: decreased inspired co2, normocapnia: normal inspired co2. External gills: e. g. in tadpoles and axolotols; protrude from the side of the animal, ventilation is passive and non-directional, oxygen diffuses from water, across gills, into blood and co2 diffuses from blood, across gills, and into water. Very ef cient: as deoxy blood enters secondary lamellae, it encounters oxygenated water owing across the outside of the lamella; oxygen diffuses across lamellae into blood and. Co2 diffuses from blood, across lamellae into water: oxygenated blood leaves secondary lamellae and enters blood vessel in lament before moving into vessel in the gill arch. Countercurrent gas exchange in the fish gill: direction of water ow and blood ow is opposite, e. g. water enters channels between secondary lamellae with a partial pressure of.