Exercise Physiology 10/2 Exam 2

what makes alveoli the ideal blood-gas interface - ANSWER--surface area, lots of alveoli -think, 1 cell thick -makes good for diffusion -they also have surfactant How do respiratory gasses (O2, CO2) move in the body? Why is this system so effective? - ANSWER--in the blood, gets there by pressure gradients, doesn't require energy what does the oxygen dissociation curve describe - ANSWER-percent oxygen saturation in arteries (carrying oxygen to tissues) what is the a-v oxygen difference and how does it change with exercise - ANSWER--difference in oxygen between arteries and veins, reflects tissue consumption of oxygen -as intensity increases, avO2 Diff increases is it the arterial or venous side in the a-v O2 difference that changes with exercise intensity - ANSWER-venous side is one mainly changes oxygen dissociation curve - what happens when high PO2 in tissues - ANSWER--when have high PO2 in tissue, get little less unloading -so percent saturation oxygen in arteries stays high oxygen dissociation