Objective: Visual counting of pulse by ‘pulse meter’!
Materials required: a stopwatch, a drinking straw or a piece of broomstick, some plastic putty or modelling clay.
Procedure: Hold the inside of your left wrist towards you. Place the index and middle fingers of your right hand on the inner side of your left wrist (on the thumb side). Feel the pulse. Now, place a small piece of putty/ modelling clay on the wrist where you feel the pulse. Press a straw or a broomstick into the putty so that it sticks upright from your wrist. Lay the back of your left hand on the table and observe.
Observation: Every time the pulse passes, the straw rocks slightly. Count the number of times the straw moves in one minute. This is your pulse rate.
Interpretation: The pressure of movement of blood through the artery at the wrist is due to beating of heart. Each wave of this pressure is called pulse. Reinforcement: What happens to the pulse rate after some vigorous physical exercise? Why does the doctor check the pulse rate of the patient? If you try the same activity on a vein, will you still observe the same rocking? Give reasons for your answer.
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