First slide

Human Respiratory System

Question

Which of the following enters the lungs?

Easy

A

Secondary bronchus
B

Trachea
C

Primary bronchus
D

Primary bronchiole

Solution

The trachea divides at the level of 5^th thoracic vertebra into a right and left primary bronchi, each of which enters the lung of that side and divides into secondary bronchi, tertiary bronchi and a series of bronchioles.

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