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If you listen carefully to someone's heart beat through a stethoscope you can hear a double beat. A faint one followed by a louder one . Suggest a reason for this
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If you listen carefully to someone's heart beat through a stethoscope you can hear a double beat. A faint one followed by a louder one . Suggest a reason for this

User Aleksander Rezen
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9 votes
the sound echoes maybe
User Jaroslaw Pawlak
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