Q. Read the following statement (A-D) :-
(A) Pharynx is the common passage for food and air
(B) Larynx is a cartilaginous box which helps in sound production and hence called the sound box.
(C) Trachea divides at the level of 2 nd thoracic vertebra into a right and left primary bronchi
(D) The branching network of bronchi, bronchioles and alveoli comprise the lungs
How many of the above statements are correct for human respiratory system.

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Solution:

Correct answer is (b) Three