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Cardiovascular Homeostasis
Task with Student Directions
Contributed by: Oregon State Department of Education


You are to choose an activity and compare how two forms of this activity affect the pulse rate. Design and investigation that compares normal pulse rate to each of these activities.

Example--You might choose an activity which uses upper body movements. Two forms of this activity would be punches and pull-ups. To investigate this activity, you would gather data on normal pulse rate and compare it to pulse rate after your subject has done punches for one minute. After an appropriate rest period, you would gather additional data for your subject after doing pull-ups for one minute.

Prepare an inquiry report including:

  • Introduction--Explain homeostasis, oxygen/carbon dioxide feedback loop, effect of pulse rate. What is a stressor?
  • Question--How does upper body exercise affect the pulse rate?
  • Hypothesis--Explain how the heart might be effected.
  • Design--Do several trials.
  • Data--Chart and graph data. Graph averages.
  • Analysis--Explain each graph siting average data. How was pulse rate effected?
  • Interpretation--
    • Why did the feedback loop change with each form of exercise?
    • How did the exercise feedback compare to the normal feedback?
    • How do CO2 and O2 levels effect the heart rate?
    • How does the heart rate effect pulse rate?
    • How does this affect homeostasis?
    • Is the respiratory rate also affected?
    • How can the design be improved?



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