Biology

Which of the following is not a part of the respiratory system ?

  1. Nostrils
  2. Lungs
  3. Mouth
  4. Trachea

Respiratory System

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Answer

Mouth

Reason — In humans, the organs of the respiratory system include nose, pharynx, larynx, trachea, bronchi and the lungs. One should always breathe through the nose and not through the mouth.

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