Lab#5: Regulation of Human Heart RatePart 1IntroductionWhy do you need to have a heart? (1mrk)_____________________________________________________________________Why do you need to have blood circulate to all the parts of your body? (1mrk)_____________________________________________________________________How does your heart pump blood? Identify the parts of heart labeled and use two different colors to illustrate the flow of blood through the heart.1
What is a heartbeat? (1mrk)______________________________________________________________________Does your heart always beat at the same rate? (1mrk)______________________________________________________________________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. (4mrks)____________________________________________________________________________________________________________________________________________Why would it be useful for the heart to beat faster during these activities or in response to these stimuli? (2mrks)_____________________________________________________________________Are there any activities or stimuli that you think may decrease a person's heart rate? (2mrks)____________________________________________________________________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 part of the laboratory period, you will carry out your experiment, analyze your data, and preparea poster describing your experiment.Measuring Heart Rate AccuratelyEach 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 theartery is called a pulse. You will be measuring heart rate by counting 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 two fingers of one hand on the palm side of your partner's wrist, over toward the thumb side of his or her wrist. You may need to press quite firmly in order to feel the pulse of blood which each heart beat sends through the artery. Don't use your thumb to feel the pulse in the wrist, because your thumb has a pulse of its own.