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These are the bronchi. (One bronchus, two bronchi).
major bronchi
The two branching tubes in the respiratory system are the bronchi. They are branches of the trachea.
The large airways that branch off the trachea are the mainstem bronchi. These branch into progressively smaller bronchioles.
bronchi
Bronchoscope.
Starting from the left and right bronchi, bronchus for singular, these branch down from the trachea. Then the bronchi branch off to smaller bronchi and these branch off to bronchioles. The bronchioles contain air sacs at the end called alveoli and alveolus for singular.
Primary broncioles.
The trachea branches off into two tubes going to each lung called the Bronchial Tubes.
Bronchi are the two tubes that branch off into each lung.
The eustachian tubes branch off the pharynx. These allow pressure balance to be maintained behind the eardrums.
The right and left primary bronchus which are the branches of trachea.