Managing blood pressure is a critical piece to heart health as high blood pressure, or hypertension, is a major risk factor ...

If you clench your hand into a fist, this is approximately the same size as your heart ... up of pressure, this time in the left atrium. The semilunar valves stop the back flow of blood into ...

All blood vessels are specifically structured to perform their function. For example, a capillary is microscopically thin to allow gases to exchange, the arteries are tough and flexible to cope ...