Human Homeostasis

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Vocabulary: dehydration, heat stroke, homeostasis, hypothermia, involuntary, thermoregulation, voluntary Prior Knowledge Questions (Do these BEFORE using the Gizmo.) A thermostat is a device that r... egulates the temperature inside a building. 1. What does a thermostat do if it gets too hot? The thermostat turns off the heat and turns on cool air. 2. What does a thermostat do if it gets too cool? The thermostat turns on the heat. 3. How do our bodies sometimes act like a thermostat? We shiver and produce goosebumps to “turn on the heat”, and we sweat to “turn on the cool.” 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 temperature and Body temperature thermometers representing the air temperature and body temperature. 1. What is the initial air temperature? 0° C, 32° F 2. What is the initial body temperature? 37° C, 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: Increase Adding clothing: Increase 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? 36° C, 97° F 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 [Show More]

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