Diagram of Lungs

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Lungs are a pair of pinkish to greyish, conical, spongy and elastic sacs. The lungs are located in the thoracic chamber which is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs, and on the lower side by the dome shaped diaphragm.Thier lower broad surfaces rest over the diaphragm. The latter also function as the floor of the thoracic cavity. Each lung is covered by two membranes or pleura, internal visceral pleura and outer parietal pleura. They form a fluid filled thin sac called pleural sac. The pleural sac protects the lungs from mechanical shock and injury, keeps the lung surface moist, and provides frictionless movements to the lungs. Thoracic cavity is air tight and the pleural sacs of the lungs are in contact with its inner lining.

Lungs are lobular organs. The right lung has three lobes namely a superior lobe, a middle lobe and an inferior lobe. The left lungs have two lobes, namely a superior lobe and an inferior lobe. Each lobe is formed of many small lobules. A bronchiole along with its branches and alveoli collectively form a lobule. So, each lobule has many infundibula. Each infundibulum consists of a cluster of alveoli. Alveoli are the structural and functional units of the lungs, and are the centres of gas exchange. The branching network of bronchi, bronchioles, and alveoli constitute the lung

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