HeartRateProtocol - Regulation of Human Heart Rate1 Part 1 Introduction Why do you need to have a heart Why do you need to have blood circulate to all

HeartRateProtocol - Regulation of Human Heart Rate1 Part 1...

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Regulation of Human Heart Rate 1 Part 1 Introduction Why do you need to have a heart? Why do you need to have blood circulate to all the parts of your body? How does your heart pump blood? What is a heart beat? Does your heart always beat at the same rate? List some activities or stimuli that you think may increase a person's heart rate. An activity is something a person does, and a stimulus is an input from the environment around a person. Why would it be useful for the heart to beat faster during these activities or in response to these stimuli? Are there any activities or stimuli that you think may decrease a person's heart rate? Today, after you learn how to measure heart rate accurately, your group will design an experiment to test how a stimulus or activity affects heart rate. During the next laboratory period, you will carry out your experiment, analyze your data, and prepare a poster describing your experiment. Measuring Heart Rate Accurately Each time the heart beats, blood is pumped into the arteries. As the blood surges into the arteries during a heart beat, each artery stretches and bulges. This brief bulge of the artery is called a pulse. To measure heart rate you will count the number of pulses in the artery in the wrist in a 30 second interval. To feel the pulse, find the artery in your partner's wrist. Place the tips of the first 1 By Dr. Ingrid Waldron, Department of Biology, University of Pennsylvania, © 2013. A Word file (which you can edit), Teacher Preparation Notes, and additional activities are available at . 1

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