1. Regulation of Human Heart Rate Lab
Intro/Directions

2. Introduction
1. Why do you need to have a heart? Why do you need to have blood circulate to all parts of your body?

3. Answers 1. You need a heart to pump blood.
2. You need blood to circulate to all the parts of your body in order for oxygen to get to all body cells (gas exchange)
Oxygen/ Carbon Dioxide exchange

4. Introduction
How does your heart pump blood? What is a heart beat?

5. Answers
The left and right ventricles pump blood to your body: ie cardiac muscle
The heart beat is the sound of two valves opening/closing in the heart.>>>>.LUB DUB LUB DUB

6. Does your heart always beat at the same rate?

7. Answer: NO

8. List some activities or stimuli that you think may increase a person’s heart rate.

9. Answers
Lots of possible answers
Exercise; nervousness; etc.

10. Why would it be useful for the heart to beat faster during these activities or in response to these stimuli?

11. Answer:
You need blood to move faster! So heart needs to pump faster in order for the blood to deliver oxygen/glucose and pick up carbon dioxide.

12. Are there any activities or stimuli that you think may decrease a person’s heart rate?

13. Answers
Relaxing exercises
Yoga
Massage
Acupucture
Reflection

14. Measuring Heart Rate Accurately
Steps to follow (use your lab sheet)
Measure pulse rate for 30 seconds
Multiply number by two

15. GROUPS OF 4 student jobs
SUBJECT (person we is getting pulse rate measured)
Measure pulse on left arm
Measure pulse on right arm
Use stop watch to time a 30 second interval
* if you have three people…one person must have two jobs!

16. Accuracy
IF both people in group did not get same reading do it again until pulse rate is accurate.

17. Designing your Experiment
Discuss with group ideas concerning activities or stimuli which may increase or decrease heart rate.
Choose a hypothesis that your group would like to test
Raise your hand when finished so I can check it!

18. Plan your experimental procedure
Must be numerical…..1,2,3 etc

19. Test your hypothesis

20. conclusion 1. Restate your Hypothesis
2. Do you accept or reject your hypothesis?
3. What was your average pulse rate? (activity or stimuli)
4. Explain why the subject’s heart rate increased while they were performing the activity. Be specific
5. IF we were to do this again, what would you change? (procedures)