How To Make Homemade Stethoscope

Prepare the sleeve
To make your own stethoscope, start measuring about 50 centimeters of the tubing.
If you have a plastic tube, you can use a garden hose old. Just make sure you clean it well before using.
Once you finish measuring, short sleeve tube or hose.
The garden hose may be too hard to cut, you will need a sharp knife. Be careful to avoid accidents should do an adult.
Attach funnels
Now that you have the tube, get a small funnel and insert it into the tube end. Make sure you stay well and then seal it with a strip of tape.
Take the large funnel and place it at the other end of the tube, too tight.
Throw a little funnel to make sure each subject and placed correctly.

Get ready to play
To test this, try to do some aerobic exercises like running or jumping for about 10 minutes.
Large funnel placed firmly on your chest and small funnel to hear the heartbeat. Count how many beats can be heard in a minute and write data.

Rest for 5 minutes or until your heart rate returns to normal. Retells the number of beats you can hear for a full minute. Write the data back and compare the two together.

This is the perfect way to learn about heart rate. Explain why the first data differ with others.