Listen To Your Heart Beat

Lula Carey Overton School
221 E 49th St.
Chicago IL 60615
(312) 535-1430

Objectives: To determine normal pulse rate To determine factors that cause the pulse rate to change To construct a graph to show variation in pulse rates To construct a simple stethoscope Materials Needed: pumping heart paper towel tubes 10 funnels tape recorder chart paper 4 jump ropes exercise tape markers plastic tubing stethoscope clay (different sizes) scissors watch with second hand Strategies: - Have students place their right hand over heart. Describe what you feel? Using an exercise tape or record that involves body movements, allow students to exercise for 2-3 minutes. Describe and compare differences in heart beats (orally). - What is the strongest muscle in your body? Why do you think this is so? The teacher will use a pumping heart to explain and demonstrate the function of the heart. - You can listen to a heartbeat, but you have to feel a pulse. Your pulse can be converted into a visual display. Give each student some clay and a matchstick. Roll a ball of clay about the size of a dime. Stick a match vertically into the ball. Place it on your wrist. Shift it around until you find the spot with the strongest beat. Describe and explain what you see. - Show the class a stethoscope. What is this? What is its function? Let each child listen to his/her heartbeat. Describe what you hear. The first stethoscope was invented in 1819. It was nothing more than a hollow tube. Place the following items on a table: paper tubes, rubber or plastic tubing of various sizes and shapes, different size funnels, cut away plastic bottles, paper cups and plastic cups, clay, scissors, tape. Give several students the opportunity to make a stethoscope (Stethoscopes must be functional). Were some items more appropriate than others? Why? Can you think of other items we can use? - Divide class into groups of five. Give each group a working stethoscope; five activity cards with the following words: napper, jumper, walker, twister, jogger, and a watch. - Each student will select an activity card and take turns exercising for 2 or 3 minutes. Count the heart beats for 15 seconds immediately after exercising. Then multiply by 4 to find the beats per minute. (Be sure to listen for the 2 part sound "lub dub" that is counted as one beat. Record results. Gr. 1 2 3 4 5 Napper _______________________________________________ Jumper _______________________________________________ Jogger _______________________________________________ Walker _______________________________________________ Twister _______________________________________________ Performance Assessment: - What is the hardest working muscle in your body? Why ? - Explain how the heart functions. - Outline the circulation of blood through the heart. - Describe the sound of a heartbeat and explain the functions of each. - What causes the pulse? - Did exercise cause the pulse to increase in rate or decrease? Explain. _ What did you learn from the data on the bar graph? How did the data differ among the groups? Explain? Conclusion: The heart is about the size of your fist. It is made of muscle. Your heart works like a pump. You hear two sounds during every heartbeat. Doctors call them lub-dub noises. Your pulse tells you how fast your heart is beating. The throb you feel is the blood rushing through the vessel with each heartbeat. During exercise your heart beats faster. When you stop, your heart rate slows down.
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