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Q.

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

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a

Trachea

b

Pharynx

c

Lumen

d

Alveoli

answer is D.

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Detailed Solution

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  • Lumen pertains to the digestive system, not the respiratory system, in humans. 
  • The surface area for food absorption is increased by lumen. 
  • Parts of the respiratory system include the pharynx, alveoli, and trachea.
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