by vthigpen
Last updated 10 years ago

Life Science

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The muscles of your heart contract and relax to pump blood throughout your body.Oxygen-poor blood (shown in blue) flows from the body into the right atrium. Blood flows through the right atrium into the right ventricle. The right ventricle pumps the blood to the lungs, where the blood releases waste gases and picks up oxygen. The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich blood to all parts of the body.

The Circulatory System

The sounds of the heart are caused by the closing of the valves. 1. The “lub” sound- quieter, longer, lower pitched- caused by the bicuspid and tricuspid valves closing. 2. The “dub” sound- louder, shorter, higher pitched- caused by the semi lunar valves closing. 3. A heart murmur is an abnormal sound of the heart. It is usually an indication of damaged valves.


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