3.22 Respiratory System Version en ligne The Respiratory System is in charge of the gases exchange between our body and the environment. Respiration can be divided in three main parts: pulmonar ventilation, external gases exchange and internal gases exchange. This diagram includes some of the most important anatomic structures related with this system. par Jorge Arizpe 1 Nasal Cavity 2 Pharynx 3 Epiglottis 4 Larynx 5 Pulmonary vein 6 Pulmonary artery 7 Diaphragm 8 Alveolus 9 Bronchi 10 Trachea 11 Oral cavity 12 Bronchiole