BIO 3302 Lecture Notes - Lecture 11: Brainstem, Partial Pressure, Bradykinin Receptor B2
2 Dec 2016
School
Department
Course
Professor
Document Summary
Water moves across the lamella; blood moves through the lamella in the opposite direction. The green arrows show oxygen moving from the water into the blood. We have water with the highest partial pressure of oxygen (i. e. inspired po2) leaking blood which also has the highest partial pressure of oxygen (i. e. oxygenated blood that leaves the gills) At the other end, we have the expired water, which has the lowest partial pressure of oxygen meeting the venous blood (also has lowest po2) Po2 that can be achieved is something approaching the expired value: for the counter-current system: the maximum po2 that can be achieved is something approaching the inspired value ---so much more affective way for transferring gas. Pao2 approaches expired po2 pao2 approaches inspired po2. For counter-current flow, the water is coming the opposite direction. E=(pio2 peo2) / pio2 x 100% [estimate of the efficiency of gas transfer]
