BSC 116 Lecture Notes - Lecture 22: Coronary Circulation, Bronchiole, Air1
4 Jun 2016
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11 steps in the flow of blood thru both circuits: right ventricle pumps blood to lungs, via the pulmonary arteries, blood flows thru capillary beds of the left and right lungs, blood returns to left atrium via pulmonary veins, left ventricle pumps blood out to body, via the aorta, including coronary arteries to the heart, one branch leads to capillary beds in the head & arms, another branch leads to capillary beds in the abdomen & legs, deoxygenated blood drains head & arms via superior vena cava, deoxygenated blood drains the abdomen & legs via the inferior vena cava, both empty to the right atrium. Gas exchange occurs across respiratory surfaces: has pressure rather than concentrations, partial pressure of oxygen is the fraction of the total pressure exerted by air, oxygen is more available in air than in water, all oxygen must be exchanged thru water: cell membranes need moist surfaces.
