Anatomy of the lung - Definition

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The lungs are the primary organs of the respiratory system. Located in the thoracic cage above the diaphragm, the two lungs are wrapped and protected on each side by the pleura, a two-layered membrane. They are separated by the mediastinum, which passes between them. Each lung is made up of lobes, with three on the right and only two on the left in order to make space for the heart. Each lung is linked to the trachea, through which air is transported, via bronchi, which then branch into smaller bronchi, then into bronchioles. This increases the overall area of oxygen exchange, with a huge number of pulmonary alveoli produced by this system allowing for gaseous exchange to take place between the air surrounding these alveoli and the blood.