Long answer I — task. Science CBSE, Class 7.

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Paheli participated in a 400 m race competition held at her school and won the race. When she came home she had mixed feelings of joy and pain as she had cramps in her leg muscles. After a massage she was relieved of the pain. Answer the following questions related to the situation.

Note: Each question has two correct answers. Choose all that apply.

1. What can be the possible reasons for the pain in her legs?

Due to the accumulation of lactic acid in the muscles.
Due to the accumulation of alcohol in the muscles.
Anaerobic respiration causes muscle cramps.
Aerobic respiration causes muscle cramps.

2. Why did she feel comfortable after a massage?

Improves circulation of blood resulting in increased supply of oxygen.
Reduces circulation of blood resulting in increased supply of oxygen.
It breaksdown lactic acid into oxygen and water.
It breaksdown lactic acid into carbon dioxide and water.

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24. Long answer I

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