Page 2 - HA 5
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                   b)  Blood

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                   c)  Circulatory system
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               Q5. Sit on a chair. Place your hand on the centre of your chest with the fingers towards the
               left side. Count your heart beat for 1 minute. Now run up and down 20 stairs at least three
               times. Again, count your heart beats as before. Is there any difference? Why do you think
               this has happened?
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