# Homeostasis and Heart Rate Lab developed by Kelly Perry

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2 Part A: Pre-Lab Questions: 1. Summarize the above information to demonstrate that you understand the concept of negative feedback: 2. What is the function of the heart? 3. Why do cells in the organs need a constant supply of blood? Data Table 1: Resting Heart Rate Actual (beats/min) Student 1 Student 2 Student 3 Student 4 1. Create a sentence comparing everyone s resting heart rate. Why was this the case? 2. Create a sentence stating the range of heart rates for your group (don t forget units). 3. Create a sentence stating the mean heart rate for your group. Part B: Investigation Question: How do different levels of exercise affect heart rate? As a group, brainstorm and agree on a form of light exercise. As a group, brainstorm and agree on a form of vigorous exercise. As a group, brainstorm and agree on a control group. Decide how long exercise should be performed for (You only have one class period.) Decide when and how measurements should be taken.

3 Variables: Independent Variable (IV): The variable you manipulated or changed Dependent Variable (DV): The variable that will respond to the independent variable (what you measure). DV units: How will the dependent variable be measured Control Test: What the IV is compared to in order to know the change was due to your test, and not some random variable. Constant Variables: What you try to keep the same during the experiment to ensure the IV was the only important variable affecting results. Write a Hypothesis (If Independent Variable, then expectation of Dependent Variable) Part C: Designing the Investigation 1. Materials List: 2. Procedure (NUMBERED! This should include more than 4 steps):

4 Part D: Collecting Data (create a data table to record all of your results; each group data table will look different than other groups since each group has their own experiment; at least three people should be tested before and after exercising). YOU MUST CREATE AND ATTACH A DATA TABLE TO YOUR LAB!! Part E: Conducting the Investigation: Repeat your investigation with three total exercise volunteers. Part F: Post-Lab Questions 1. Use data to describe how the heart rate changed during exercise? 2. Reference the data to compare and contrast the heart rate between different activities. 3. Evaluate why everyone s heart rate changes different amounts during exercise. 4. Evaluate what happens to heart rate after exercise is finished?

5 Part G: Standard CA.3 Assessment: Focus on Homeostasis 1. Explain why heart rate changes during exercise. 2. What other changes did you observe during your exercise? Describe how these changes relate to changes in heart rate. (2 part question!) 3. Illustrate any evidence (data and observations) you collected in this investigation that suggested the body was able to maintain homeostasis after exercise was finished. 4. Predict what would happen if your heart rate failed to increase during exercise and describe why. Evaluate what would happen if your body failed to return to normal after exercise. (3 part question!)

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