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Unit 19: Biology Part 2 Page 95 of 137

Activities and Experiments

Lesson 3: Cardiovascular System

Experiment: A Very Simple Stethoscope

Materials:

 1 cardboard tube
 1 paper towel roll

The first stethoscope was simply a wooden tube. In this activity, you will
make your own simple stethoscope.

1. Place a cardboard tube from a paper towel roll over the heart. Try to
hear the “lub-dub” sound.
2. Experiment with various exercises to change the heart rate you hear in
your stethoscope.

Experiment: The Best Workout

Materials:

 Pen
 Paper
 Stopwatch or clock

1. Make a hypothesis about what exercise will get your heart beating the
fastest: running in place, jumping jacks, hopping on one foot, or
stepping onto and off of a chair.
2. Measure your pulse for 30 seconds and multiply by 2, to get resting
pulse in beats per minute.
3. Run in place for two minutes
4. Measure your pulse immediately after running, again for 30 seconds,

multiplying by two.
5. Rest for several minutes
6. Repeat steps 2-5 for jumping jacks, hopping, and chair steps
7. Make a bar graph showing the increase in pulse for each exercise

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