Question

question 5
other than holding your breath, what can affect your heart rate? list at least three variables that can affect heart rate.
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question 6
choose one of the variables from your list, and design an experiment to test the impact on heart rate.
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question 7
formulate a hypothesis about how the variable will affect heart rate.

Explanation:

For Question 5, physical activity increases the body's oxygen - demand, thus raising heart rate. Caffeine stimulates the nervous system, leading to a faster heart rate. Stress triggers the release of stress - hormones like adrenaline, which elevates heart rate.
For Question 6 (using caffeine as an example), we can have two groups of participants. One group drinks a caffeinated beverage and the other drinks a non - caffeinated placebo. Measure the heart rate of each participant before and at regular intervals after consuming the beverage.
For Question 7 (using caffeine as an example), the hypothesis could be: Consuming caffeine will cause an increase in heart rate within 30 minutes of ingestion.

Answer:

Question 5: Physical activity, caffeine intake, stress.
Question 6: Have two groups of participants. One group drinks a caffeinated beverage and the other drinks a non - caffeinated placebo. Measure heart rate before and at regular intervals after consumption.
Question 7: Consuming caffeine will cause an increase in heart rate within 30 minutes of ingestion.