Write short note on the following:Lung

1.	Write short note on the following:Lung
Answer» 1. Pair of lungs is the main respiratory organ in the human body. They are located in thoracic cavity. 2. They are present on either sides of heart. 3. Each lung has double layered pleural membranes. 4. Trachea bifurcates into two bronchi. Each bronchus enters lung on its side and S divide and re-divide into fine bronchioles. 5. At the end of each bronchiole there is alveolus. Alveolus is surrounded by capillary network. 6. Each alveolus is extremely thin walled and hence gaseous exchange can occur through diffusion here. Due to thousands of alveoli, the lung surface is increased many a times. 7. Deoxygenated blood coming from heart by pulmonary arteries is purified here in the lungs. 8. It is mixed with oxygen due to gaseous exchange and returned back to the heart by pulmonary veins. Lungs thus continuously help in oxygenation of blood with the help of all of the alveoli.

Answer»

1. Pair of lungs is the main respiratory organ in the human body. They are located in thoracic cavity.

2. They are present on either sides of heart.

3. Each lung has double layered pleural membranes.

4. Trachea bifurcates into two bronchi. Each bronchus enters lung on its side and S divide and re-divide into fine bronchioles.

5. At the end of each bronchiole there is alveolus. Alveolus is surrounded by capillary network.

6. Each alveolus is extremely thin walled and hence gaseous exchange can occur through diffusion here. Due to thousands of alveoli, the lung surface is increased many a times.

7. Deoxygenated blood coming from heart by pulmonary arteries is purified here in the lungs.

8. It is mixed with oxygen due to gaseous exchange and returned back to the heart by pulmonary veins. Lungs thus continuously help in oxygenation of blood with the help of all of the alveoli.

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