Name:
Group:
Date:
Period:
Lab: Homeostasis and Exercise
Prelab:
1) What is homeostasis?
2) How does the body maintain homeostasis?
3) How might homeostasis be upset by exercise?
Directions: In this lab we are going to see how exercise affects
someone’s temperature, heart rate, and blood pressure. You will work
with a group to determine the effects on the circulatory system,
respiratory system, and integumentary system.
Question:
How does exercise affect a person’s heart rate, breathing rate, and
perspiration level?
Hypothesis: Write a hypothesis on the effect of exercise on the
dependent variables you are measuring. Your hypothesis should
provide a solution to the problem we are addressing. Read the
procedure first to get a better understanding.
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Materials: A stopwatch (the one on your cell phone is fine)
Procedure:
1) Choose one person in the group to exercise. Measure that
person’s heart rate by taking their pulse for 15 seconds. Multiply that
number by four to calculate the beats per minute.
*NOTE* IF the person exercising feels discomfort at any time, stop
the experiment and inform Mr. Kemper immediately.
2) Measure the person’s breathing rate by counting the number of
breathes they take for 15 seconds and multiply that number by 4 to
get breaths per minute.
3) Rate the person’s perspiration level from 1-5 (1 = none, 5 =
droplets dripping down their face.)
4) Record the data on the provided data table.
5) Have the person jog in place for 2 minutes. When the two minutes
are up, measure their heart rate, breathing, and perspiration level
again. Record the data on the data table. Repeat this step three more
times and record your data at each point.
6) After the third recording of the data. Wait one minute and measure
their heart rate, breathing and sweat one last time. Record their data
again.
Experiment and Data Collection:
Table #1: Effects of Exercise
Time (Min)
Heart Rate
(Beats/Minute)
Breathing Rate
(Beats/Minute)
Perspiration
Level
(1 Dry-5 Sweaty)
0
2
4
6
8
9
Other observations: Were there any other physiological changes in
your exercising classmate?
Analyze and Conclude: (answer in complete sentences)
1) What are the independent/dependent variable in this experiment?
2) Graph the relationship between the independent and dependent
variables on the graph provided on the next page. You can graph all
three sets of data on the same graph, just be neat and label your
lines and axes.
3) What are the effects of exercise over time on the circulatory and
respiratory systems and the perspiration level?
4) What other processes could you have measured to determine the
external and internal effects of exercise on the body?
5) Write or draw out how feedback inhibition was working to maintain
homeostasis.
6) How is perspiration related to body temperature? How is
perspiration related to homeostasis?