Question: the death of a few airline passengers has led to...
The death of a few airline passengers has led to worry about
economy-class syndrome. The theory is that sitting motionless for
long periods on flights allows blood to pool and clots to form in
the legs. Low oxygen levels in airline cabins may increase
clotting. If a clot becomes large enough to block blood flow or
breaks free and is carried to the lungs or the brain, the outcome
can be deadly.
Given what you know about blood flow in the veins, explain why periodically getting up and moving around in the airplane's cabin during a long flight may lower your risk of clot formation.