Learn how the Heart Works in this educational video from dizzo95.
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Male Speaker: Heart valves control the direction of the blood that flows through the heart. There are four valves; two regulating inflow; two regulating out flow. Notice how the valve snap shut when blood is push back against them. Dual heart valves look and work like this tricuspid valve, pulmonary valve, mitral or bicuspid valve, aortic valve.