Regulation of Human
Heart Rate Lab
Intro/Directions
Introduction
1. Why do you need to have a
heart? Why do you need to
have blood circulate to all parts
of your body?
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
Introduction
How does your heart pump
blood? What is a heart beat?
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
Does your heart always beat at
the same rate?
Answer:
NO
List some activities or stimuli
that you think may increase a
person’s heart rate.
Answers
Lots of possible answers
Exercise; nervousness; etc.
Why would it be useful for the
heart to beat faster during
these activities or in response
to these stimuli?
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.
Are there any activities or
stimuli that you think may
decrease a person’s heart rate?
Answers
Relaxing exercises
Yoga
Massage
Acupucture
Reflection
Measuring Heart Rate
Accurately
Steps to follow (use your lab sheet)
1. Measure pulse rate for 30 seconds
2. Multiply number by two
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!
Accuracy
IF both people in group did not
get same reading do it again
until pulse rate is accurate.
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!
Plan your experimental
procedure
Must be numerical…..1,2,3 etc
Test your hypothesis
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)