00:00The sound of your heartbeat, lub-dub, comes from your heart valve's closings.
00:05These valves control the direction of blood flow and stop blood from moving backward.
00:10The first sound happens when blood is pushed out, and the second sound happens when the heart resets for the
00:17next beat.
00:18So the heartbeat you hear is not just a sound, it is your heart's rhythm of life.
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