The visceral pleura lies in contact with the Lungs. The outer membrane of the pleural sac is known as the parietal pleura, and the inner membrane is known as the visceral pleura. Lungs are enclosed in a pair of extremely thin double membrane sacs known as pleural sacs. It is located inside the thoracic cavity, which is a tight camber, bounded by the diaphragm on the lower side, ribs on the sites, and in front with sternum and thoracic vertebrae on the back. The Lungs are the principal organ of the respiratory system. The respiratory tract includes a pair of nostrils, nasal cavity, internal nares, pharynx, larynx, trachea, and bronchioles. The fresh air from the atmosphere reaches into the Lungs and stands with CO2 coming out from the body. The respiratory tract is a deeply placed passage into the Lungs that connect with the atmosphere. The respiratory system of humans includes a long respiratory tract, respiratory organs, and Lungs. The upper respiratory system starts from the nose, and the lower respiratory system starts from the lungs. The lungs are the central part of the respiratory system, but the whole system is divided into two parts. Therefore, lungs are designed to exchange harmful gases out of our body and suitable gases to enter the body. It also needs carbon dioxide to be reduced. Every cell needs oxygen to be alive and healthy in the human body. So first of all let’s see lungs definition – Lungs are the central organ of the respiratory system.
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