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Which of the following statements are correct with respect to the human respiratory system?
(a) The branching network of bronchi and bronchioles excluding alveoli comprise the lungs.
(b) The glottis is covered by a thin elastic cartilaginous flap called epiglottis.
(c) Pleural fluid reduces friction on the lung surface.
(d) Initial bronchioles are not supported by incomplete cartilaginous rings.
Choose the correct answer from the options given below.

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(a) and (b) only

(a), (b) and (c) only

(a), (c) and (d) only

(b) and (c) only

answer is D.

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Detailed Solution

The branching network of bronchi, bronchioles and alveoli comprise the lungs.

The tracheae, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings.

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