The figure shows a diagrammatic view of the human respiratory system with labels A, B, C and D. Select the option that gives correct identification and main function and/or characteristic of one label.

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A: Epiglottis - Prevents the entry of food into the larynx

B: Trachea - Lined by simple squamous epithelium

C: Bronchus - Supported by incomplete cartilaginous rings

D: Diaphragm - Contracts during expiration

answer is C.

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Detailed Solution

The trachea, bronchi and initial bronchioles are supported by C-shaped (incomplete) cartilage rings. 'A' is not the epiglottis but the thyroid cartilage of the larynx. The trachea is lined by pseudostratified columnar ciliated epithelium (not simple squamous); The diaphragm contracts during inspiration but not expiration.

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