MAKING A STETHOSCOPE (5th Grade)

When the valves in our heart open and close to pump blood they make a “lub dub” sound.
With every heartbeat the heart muscles contract to pump blood around the body.
Doctors use a stethoscope to listen to the heart because it is difficult to hear the
heart’s valves without one.

Meet “Redy” the red blood cell. (Click on play to listen)

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