The four valves of the heart allow blood to flow through the heart in the right direction. The valves open or close each time the heart beats. Problems with the heart valves can lead to palpitations, ...
Ever been to a large sporting event, such as a football or baseball game with 60,000 screaming fans? What you don’t hear through the screams is a clicking sound in the chests of about 1,500 of these ...
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