is used by doctor to count the heart beats
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Your doctor will use a stethoscope to hear your heartbeat. The opening and closing of your heart's valves make a "lub dub" noise. The doctor can check your heart and valve health and hear your heart's rate and rhythm by listening to those sounds
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Stethoscope
Explanation:
Your doctor listens to your heart with a stethoscope. The opening and closing of your valves make a "lub dub" sound known as heart sounds. The doctor can evaluate your heart and its valves and hear your heart's rate and rhythm by listening to your heart sounds.
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