Air enters the body through the nose and mouth, and then passes through a short corridor known as the larynx, for which there is a trachea, which divides into two bronchi lined śluzowatą lining, which removes dust.
Bronchi leading to the lungs in which to divide up into smaller - a payment for each lung (left lung consists of two panels, and the right of the three), and then divided into more and more smaller and narrower, for oskrzeliki and finally end oskrzeliki that flee vesicular to tiny bags, each of which consists of several parts or alveolitis.
the blood and bronchial oskrzelików led by a branch of the pulmonary artery that carries blood without oxygen from the right side of the heart to the lungs.