Airways

The passageways that air moves through while travelling in and out of the lungs during breathing. The airways begin at the mouth or nose and reach the trachea (windpipe) via the pharynx. The trachea branches into the left and right main bronchi, which themselves then branch into large bronchioles, one for each lobe of the lung. Within the lobes, the bronchi further subdivide some 20 times, ending in clusters of alveoli.