1) How does the decrease in vital capacity potentially influence an individual's athletic performance or aerobic condition as aging occurs?
2) What is the functional nature of a "portal system" and how does it differ from normal venous return flow?
3) Why might a clot in the lungs (a pulmonary embolism) occur after a deep vein thrombosis in the leg?
4) Name the section of descending aorta inferior to the diaphragm?