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Which of the following is not part of the human respiratory system?(a) Pharynx(b) Alveoli(c) Trachea(d) LumenI have been asked this question during an online exam.Enquiry is from Human Respiratory System in portion Breathing and Exchange of Gases of Biology – Class 11

Answer»

Right choice is (d) Lumen

To EXPLAIN: Lumen is not a part of the human respiratory system whereas it BELONGS to the DIGESTIVE system. Lumen increases the surface area for the absorption of food. Pharynx, alveoli, and trachea are part of respiratory system.



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