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Eventually, the bronchi become known as bronchioles â the smallest air tubes in the lungs. This system of air tubes can be thought of as an upside down tree, with the trachea being the main trunk and the bronchi and bronchioles being the branches. The medical term for all the air tubes is 'the respiratory tract'.
Air normally enters through the nostrils. It passes to the larynx (voice box) and then the trachea. From there, it passes through the bronchus to the lungs. A pair of lungs hang free in the thoracic cavity. An air tube called bronchus connects each lung to a trachea.Lungs contain millions of alveoli which are the sites of gas exchange between air and blood.t passes to the larynx (voice box) and then the trachea. From there, it passes through the bronchus to the lungs. A pair of lungs hang free in the thoracic cavity.