Materials Required:
l Wooden match
l Thumbtack, with a wide, flat surface
Procedure:
You can feel your heart beating, but did you know that you can also see it beating? All it takes is a simple device, which you can make in a few minutes.
- Press a wooden match onto the point of the thumbtack.
- Set your device on top of your wrist and move it from place to place until you find a strong beat—your pulse. Your device will respond by tick-tocking back and forth like a grandfather clock pendulum.
- Count how many times the wooden match moves in one minute.
This Is What Happens:
When you measure how many times your heart beats, you are taking your pulse. Blood is pumped by your heart throughout your entire body, carried by arteries and veins. Some veins are close to the surface in your wrist, and this is a good place to measure the beating action. You probably obtained a count between 90 and 120 beats. As you grow older, your heart will slow down to about 80 beats per minute.
