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Unit 1 – Cells and SystemsGrade 8 ScienceRespiration Lab: Heart and Breathing Rate During ActivityIntroduction:When you go for a fast run, notice that you start to pant and sweat. In this activity you will investigate what happens to your heart rate and respiration rate as you increase your activity level. Problem/Question:What happens to a person’s heart rate and respiration rate as they increase their activity level?Hypothesis: __________________________________________________________________Materials:PartnersStopwatchProcedure:1. Find your heart rate (pulse) by placing two fingers on your wrist or your carotid artery (neck, beneath your jawline). Ask for assistance if you experience any difficulty with this task.2. Count each thump as one beat.3. Sit in your chair, resting for one minute. Afterwards, have your partner time you for ten seconds as you count the number of beats. Multiply the number of beats by six. This is how much your heart beats in a minute while you are resting (this is your resting heart rate). Record the number of beats in the data table.4. Repeat the above activity of sitting for one minute, but then calculate your resting respiratory rate by counting how many breaths are taken in ten seconds. Multiply the number of breaths by six - this is how much your heart beats in a minute while you are resting (your resting respiratory rate). Record the number of breaths in the data table.5. Stand up and have your partner time you for one minute as you go for a brisk walk. At the end of a minute count the number of beats for ten seconds. Multiply the number of beats by six to determine the number of heart beats in a minute while walking (your walking heart rate). Record the data in the data table. 6. Repeat the above step, but counting your breaths. Record your walking respiratory rate.7. Repeat the above procedures, this time after sprinting for one minute (your running heart rate). Record your running heart rate and respiratory rate in the data table.8. Calculate the average heart rate and the average respiratory rate for each category (resting, walking, and running).Paraphase Proceedure in your own words______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Data: (Include appropriate units for your data)Recreate this data table and include in your lab write up.Sitting/Resting for 1 minuteWalking for 1 minuteSprinting for 1 minuteHeart RatePerson 1Person 2TotalAverageRespiratory RatePerson 1Person 2TotalAverageCreate a bar or column graph illustrating only the average heart rate and the average respiratory rate for each category (resting, walking, and running). You may create one in Microsoft Excel or Microsoft Word (insert chart).Analysis:Consider the experiment and refer to your data table and graph to answerthe following questions.1. Why did you create a group average rather than simply using data fromone person to make conclusions about the heart rate?2. What variable did you (the experimenter) purposely change or manipulate in theexperiment? Consider this the “cause” in a cause and effect relationship. Is this the dependent or independent variable?3. What was the response to the factor you purposely changed in theexperiment? Consider this the “effect” in a cause and effect relationship. Is this the dependent or independent variable?4. What characteristics or components of the experiment were (or should havebeen) consistently the same or unchanged throughout?5. What patterns or trends did you notice in your data when looking at your data tableand/or graph?Conclusion & Application:Does your data/results support your hypothesis? Explain your reasoning.State sources for error in your experiment (ie. What factors would make the results not completely accurate).How would you predict your results would differ if you were to conduct this experiment on people who smoked or who had asthma? Explain your reasoning.Give a statement on how the results of the experiment connect to our bodies’ needs to perform various activities throughout our day. (ie. Why did the heart rates and breathing rates change like they did during the different activities?)Possible MarkTitle*1Purpose*1Hypothesis1Materials*1Method/Procedure2Data Table5Graph5Analysis5Conclusion/Application4Spelling and Headings2Total27*Included on a separate page. ................
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