NCERT Solutions for Class 7 Science Chapter 10
Important NCERT Questions
7th Chapter 10 Gravitation
NCERT Books for Session 2020-2021
CBSE Board and State Board
Questions No: 1
Why does an athlete breathe faster and deeper than usual after finishing the race?
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When the athlete runs in the race, his body needs more energy. In order to get extra energy, the athlete breathes faster. Because more oxygen is supplied to our cells. It speeds up the breakdown of food and more energy is released.
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After finishing race lactic acid is accumulated in muscles. This causes stiffness/ cramps in muscles. Faster and deeper breathing improves oxygen supply to the muscles converting lactic acid into carbon dioxide and water.