Homemade Stethoscope

Sound is made up of vibrations. When anything makes a sound it vibrates and then these vibrations spread through the air to reach your ears.

When your heart beats, the vibrations of this movement travels through your chest and you can use a stethoscope to hear it.

A stethoscope is an instrument used my medical professionals to hear sounds in the body. They are used to listen to the heart, lungs and intestinal tract. They are also used when measuring blood pressure.

ACTIVITY:

Learn how to make a scientific instrument and use it to measure a person’s heart rate and breathing before and after exercise

MATERIAL:

• Flexible plastic tubing, about ½” diameter, at least 1.5 feet for each stethoscope
• 20o.z. soft drink bottle
• Masking tape
• Scissors

PROCEDURE:

Cut off tops of bottles to make a funnel shape and tape tubing through the mouth of the bottle

Use the stethoscope to measure someone’s heart rate while they are sitting down, standing up, lying down and after jumping rope or tossing a ball

Count the heart beats per minute (either directly or by counting for six seconds and multiplying by ten.)

Notice any differences? How does it vary by activity?

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