Girlstart - Smart from the Start
 
About Us

Start Learning
Free Lessons
Learn about some cool stuff from making a webpage to bugs!

Cool Science
Get fun science experiments and more that you can do at home!

Homework Rescue
Find a listing of websites that can inspire you or help you with your homework.

Brain Teaser
Wrap your mind around this brain teaser and figure out the answer!
Cool Science

Homemade Stethoscope

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?



start learning | start playing | start working
| start your life | home


© Copyright 2003-06 by Girlstart. All Rights Reserved. Privacy Policy

 
Start Learning!
Start Playing!
Start Working!
Start Living!
Did You Know?
Plants produce scents as oils mainly to attract insects to pollinate their flowers. They also produce oil in their leaves to stop them from drying out in strong sunshine.

Keep Exploring!
Do some yucky mad science over at Discovery.com.