Which of the following is a secondary respiratory organ?

Mouth

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Nose

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Nasopharynx

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Trachea

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Solution

The correct option is C Mouth
The mouth is a secondary respiratory organ as it can perform the function of nose for inspiration and expiration, for a short duration due to blockage in nostrils for some reason. However, it cannot filter and warm the air as it happens in the nostrils.
So, the correct answer is 'Mouth'

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