talhaahmed0320 talhaahmed0320
  • 21-01-2021
  • Biology
contestada

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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sabrinae16 sabrinae16
  • 21-01-2021
the sound echoes maybe
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