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Name: Ladeja Anderson Date: 06/16/2014

1.3.1.2 - 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? It automatically lets out heat so it will warm back up.

2. What does a thermostat do if it gets too hot? It automatically lets out cool air so it will cool down.

3. How do our bodies sometimes act like a thermostat? Through homeostasis, our body warms up when it is too cold and cools down when it’s too 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? 32˚F

2. What is the initial body temperature? 99°F

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: increase Sweating: decrease

Lowering air temperature: decrease Shivering: same

Adding clothing: same Exercising: 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°F

2. Gather data: Fill in the first line of the data table below. Then,...