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प्रश्न
What change occurs in heart beats if a person runs for a while? Why?
लघु उत्तरीय
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उत्तर
A person’s heart beats faster after running for a while because the body needs more energy. The faster heart beat pumps more oxygenated blood to the muscles and other organs, supplying more oxygen for rapid respiration and thus producing more energy.
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अध्याय 1: Life Processes - Exercise 3 [पृष्ठ ८९]
