Exam (elaborations) Student Exploration Human Homeostasis

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 This study source was downloaded by from CourseH on :35:15 GMT -05:00 This study resource was shared via CourseH 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.