RAFT Simple Stethoscope STEM Relationships: Listening to the heart is a practical way to teach students about how the heart pumps blood through the circulatory system. The sounds of the beats provide information on heart valves, heart rate, and they reveal the relationship between circulation and respiration. This simple device allows students to appreciate the importance of the stethoscope in medicine and the study of human biology. Science    

Identify patterns in heart beats before and after vigorous exercise. Examine properties of materials used to create vibrations heard through the stethoscope. Identify different parts of a heart and draw a picture of the heart with labels. Plan and conduct an experiment to identify the relationship between heart rate and breathing.

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Draw a picture of the heart based on own understanding, and then write a paragraph about the function of the heart. Work with a partner/team and design a binaural stethoscope using other accessible materials.

Find and use an online application to analyze the sounds produced by various materials that might be used in the stethoscope design Use the internet to find information on the history of clothing fabrics and their uses in different climates. Correlate these findings to different materials used to make stethoscopes. Use modeling software to create 3-D images of the human heart Use any drawing applications to create a map depicting blood flow through the human circulatory system.

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Create a graph of heart rate vs. time for two conditions: before and after exercise Measure and compare heart rate vs. time and breathing rate vs. time. Derive a math function relating all these quantities Listen to your heart beat and try to identify the opening and closing of heart valves based on the “lub dub” pattern Identify the relationship between the surface area of the stethoscope membrane and the volume/clarity of the sound heard. Use math symbols to write a conceptual model of the relationship to present to peers.

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