Cardiovascular disease is the leading cause of mortality worldwide. As cigarette smoking continues
An older man rides an exercise bike while taking an aerobic capacity test, one of a number of cardiac tests that can be used to determine if the warning signs of heart disease are present.
The heart is a muscle in the center of the chest. It is approximately the size of a fist and pumps blood throughout the body, working continuously and requiring a large blood supply. The heart can function through a large range of demands, from sleep to vigorous activity.
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