Over 170 years ago, a man named Laennec invented the first stethoscope. It was a wooden tube about 1 inch in diameter and about 10 inches long.
1 cardboard tube from a paper towel roll per every 2 students
- Have the students pair up and listen for their partner's heartbeat by placing the tube over the partner's heart.
- Count the number of beats per 30 seconds. Add this number together twice to find out how many times each minute the person's heart beats.
- Have one partner run in place for one minute, then listen again. Have the students write down what they hear and calculate the new beats per minute.
- Have the partners switch.
The heart beats faster after the exercise in order to pump more blood (oxygen) to the working muscles.
Study more about the heart - do diagrams; trace the path of blood through the heart and lungs; read about the heart; think of all the ways we use the word "heart" (heart-throb, heartbreak, heartless, heart-to-heart, heartsick, heart-rendering, take to heart, by heart, hearty, heartfelt).