Human Homeostasis

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  • Topic: Temperature, Celsius, Absolute zero
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  • Published : March 29, 2013
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Name: ______________________________________Date: ________________________

1.3.1.2 - Human Homeostasis

Vocabulary: dehydration-lack of water needed in your body
Heat stroke-highest body temperature where you need medical attention Homeostasis- when an organism maintains stable internal conditions in a changing environment Hypothermia-lowest body temperature where you need medical attention Involuntary-automatic occurance

Thermoregulation -the process in which a steady temperature is maintained inside the body Voluntary-occurance in which you have to think about and make a choice to do

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? __________lowers the mercury level__________________________

2. What does a thermostat do if it gets too hot? _____________increases the mercury level________________________

3. How do our bodies sometimes act like a thermostat?
_______________________We react to the heat or cold with changing to a level that is stable__________________________________________________

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? _______32 degrees Fahrenheit______

2. What is the initial body temperature? _____99 degrees Farenheit______

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: increaseSweating: decrease

Lowering air temperature: decreaseShivering: increase

Adding clothing: increaseExercising: increase

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? _____97 degrees farenheit______

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| 99°F| 97°F| decrease|
Exercising| 99°F| 100°F| increase|
Sweating| 99°F| 93°F| decrease|
Shivering| 99°F| 99°F| same|
Adding clothing| 99°F| 99°F| same|

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? Because your body is using its energy which creates heat. C. Which factor lowered body temperature the most? ________sweating______

D. Why do you think this process lowers body temperature? _________Our body is trying to cool us off to...
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