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Lab #: 12 Topic: Human Thermoregulation Aim: To investigate the effects of changing temperature on the human body Introduction: Normal human internal body temperature ranges between about 97.6 99.6℉ (36.1°C to 37.8°C). In this activity, you will explore the relationship between core (or internal) temperature and surface temperatures under different conditions. This exploration will help you understand how the body moderates specific external changes with specific internal responses. Brainstorm: What are all of the things that happen when you are cold or hot. How does your body respond to keep you from overheating or freezing? ● What are the hottest temperatures humans can withstand? ● What are the coldest temperatures? Research Question: Does the human body regulate internal temperature in response to changes in external temperature? Hypothesis: ___________________________________________________________________________________________ Materials (per team of 4) 2 Thermometers (1 immersion, 1 oral) Disposable thermometer probe covers Ice water Warm water Stopwatch or clock with a second hand First aid tape Paper towels Method ( Part 1) body change in response to cold temperature. 1.
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Chose 1 test subject, 1 data collector, 1 data recorder, and 1 person to be in charge of materials Measure the initial temperature of the surface of the skin by gently grasping the thermometer probe between your thumb and fingers Record initial skin surface temperature in the table table 1( Draw table 1 in your lab note book) Measure initial internal body (core) temperature using the oral thermometer Record initial internal temperature in table 1. Immerse the hands of the test subject into icy water for 30 seconds Measure and record surface skin temperature by gently grasping the thermometer probe between your thumb and fingers Record observations about the test subject’s response to the icy water (i.e. skin color change, shivering, etc) Measure and record internal (core) body temperature using the oral thermometer Wait for 2 minutes before moving on to part 2 Table 1 Title: ____________________________________________ Skin Surface Temperature (℉) Internal (core) Body Temperature (℉) Observations Initial Temperature Final Temperature After exposure to icy water Temperature change (Initial Final) Method ( Part 2) body change in response to hot temperature. 1. Measure the initial temperature of the surface of the skin by gently grasping the thermometer probe between your thumb and fingers 2. Record initial skin surface temperature in the table table 2( Draw table 2 in your lab note book) 3. Measure initial internal body (core) temperature using the oral thermometer 4. Record initial internal temperature in table 2. 5. Immerse the hands of the test subject into warm water for 30 seconds 6. Measure and record surface skin temperature by gently grasping the thermometer probe between your thumb and fingers 7. Measure and record the internal body (core) temperature using the oral thermometer and record in table 2 8. Record observations about the test subject’s response to the hot water (i.e. skin color change, shivering, etc) Table 2: Title: ____________________________________________ Skin Surface Temperature (℉) Internal (core) Body Temperature (℉) Observations Initial2 Final Temperature (After exposure to warm water) Temperature change (Initial after warm water) Developing a Scientific Explanation Tool (DSET) 1. Prewriting What is your question? Does the human body core ( internal) temperature change when temperatures at one’s extremities change? Support for your explanation Claim based on the evidence (What is the answer to your question based on your evidence?) Evidence (Observations/data that answers your question) Scientific Reasoning (Why you think this happened based on background research) 2. Drafting Write your explanation in paragraph form. Scientific Explanation = Claim + Evidence + Science Reasoning My claim is (fill in with above claim) because (evidence and science reasoning)

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