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ACTIVITY 2 Take a glass or plastic funnel and attach a rubber tube to its stem (as shown in Figure 9.5a). Put the open end of the tube to your ears. Then place the mouth of the funnel on your friendschest and listen carefully. Do you hear a sound of something beating? This is the heart beat ofyour friend. You can also feel for the pulse in your wrist and count the beats (Figure 9.5 b).Similarly count the number of heart beats per minute of your friends too. Also count the numberofbeats after running for a while and write the values in Table 9.2 made in your notebook. |
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Answer» ears. Then PLACE the MOUTH of the FUNNEL on your friendschest and LISTEN carefully. Do you hear a sound of something BEATING? This is the heart beat ofyour friend. You can also feel for the pulse in your wrist |
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