Student Exploration: Human Homeostasis
Vocabulary: dehydration, heat stroke, homeostasis, hypothermia, involuntary, thermoregulation,
voluntary
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
A thermosta
...
Student Exploration: Human Homeostasis
Vocabulary: dehydration, heat stroke, homeostasis, hypothermia, involuntary, thermoregulation,
voluntary
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
A thermostat is a device that regulates the temperature inside a building.
1. What does a thermostat do if it gets too cool? The thermostat turns on the heat
2. What does a thermostat do if it gets too hot? The thermostat turns on the air conditioner
3. How do our bodies sometimes act like a thermostat? Our bodies turn sometimes to heat
when we get hot.
Gizmo Warm-up
To survive, an organism must be able to maintain
stable internal conditions in a changing environment.
This process is called homeostasis. The Human
Homeostasis Gizmo allows you to explore how the
human body stays at a nearly constant temperature in
different conditions. Notice the Air temp. and Body
temp. thermometers representing the air temperature
and body temperature.
1. What is the initial air temperature? 32F
2. What is the initial body temperature? 99F
3. Next to each factor listed below, write “increase,” “decrease,” or “same” based on how
you expect that factor to affect body temperature.
Raising air temperature: decrease Sweating: increase
Lowering air temperature: increase Shivering: decrease
Adding clothing: increase Exercising: decrease
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2019
Activity A:
Body temperature
Get the Gizmo ready:
If necessary, click Reset ( ).
Question: What factors increase or decrease body temperature?
1. Observe : With the Air temp. at 0 °C (32 °F) and Body temp. at 37 °C (99 °F), click Play (
). After one simulated hour (does not have to be exact), click Pause ( ).
What is the body temperature after one hour? 97F
2. Gather data : Fill in the first line of the data table below. Then, use the same procedure to
test the effect of each of the following factors. Click Reset between each trial. Record the
initial and final body temperatures in the table below. (Leave the last column blank.)
Set the Exercise level to 70%. (All other settings in default position.)
Set the Sweat level to 70%.
Under Body position, select Shivering.
Next to Clothing, click Add four times to add a sweatshirt, hat, pants, and parka.
Factor Initial body
temp.
Body temp.
after one hour
Effect of factor on body
temperature
Standing still 99F 97F Lowered body temperature
Exercising 99F 100F Raised body temperature
Sweating 99F 95F Lowered body temperature
Shivering 99F 99F Raised body temperature
Adding clothing 99F 99F Raised body temperature
3. Analyze : To determine the effect of a factor on body temperature, compare the final body
temperature with that factor to the final body temperature while standing still. Based on this
comparison, fill in the last column of the data table.
A. Which factor raised body temperature the most? Exercising
B. Why do you think this process raises body temperature?
When you exercise you sweat and then your body becomes warm which makes the
body temperature raise.
C. Which factor lowered body temperature the most? Sweating
D. Why do you think this process lowers body temperature?
When the sweat goes away your body temperature raises again.
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