Medical illustration of the respiratory system and alveoli. The respiratory system is depicted in a woman's silhouette. We can see in transparency the lower part of the heart which rests with the lungs on the diaphragm. The larynx is in section, the entire trachea and the bronchi and bronchioles are visible in transparency in the lungs. The lymph node chain is represented around the trachea and the bronchi. In the zoom of the pulmonary alveoli, the smooth muscles and the network of blood capillaries for gas exchange are represented. One of the alveoli in section shows the alveolar bags and the alveolar duct. This image cannot be sold in Belgium for use by a pharmaceutical company. - Restriction : Exclusive to pharmaceutical laboratories in Belgium. from 01/25/2020