How does caffeine pills affect a human being's heart rate?Hypothesis: If a human being takes up to 2 caffeine pills then, their heart rate will increase because, the caffeine enters the bloodstream causing some receptors to be stimulated.
Materials: 6 Caffeine Pills (200mg each), Stethoscope, Timer
Procedure: 1. Take the heart rate of an individual with a stethoscope who has no caffeine in their system. Record data.
2. Have the individual take ONE caffeine pill, wait 20 minutes before recording heart rate. 3. After 4 hours of taking the first caffeine pill, take ONE more. 4. Wait another 20 minutes before recording heart rate. 5. Repeat steps #1-4 2 more times for a total of 3 time to get the most accurate data. Be sure to perform experiment on different days.
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