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Question

For which of the following process is Oxygen a prerequisite?

A
Inspiration
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B
Expiration
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C
Both (A) and (B)
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D
Inspiration and combustion
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Solution

The correct option is D Inspiration and combustion
Oxygen is the major constituent during inspiration (inhalation) and combustion because both these processes cannot occur without oxygen. Oxygen from inspiration is used to combust the food to release energy and any fuel when combusted, releases energy. Hence oxygen is a must for combustion.

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