How exchange of gases take place in Alveoli? | Gaseous Exchange in Lungs | Respiratory System
How exchange of gases take place in Alveoli? | Gaseous Exchange in Lungs | Respiratory System
Exchange of respiratory gases, oxygen and carbon dioxide take place in the alveoli of the lungs. Oxygen which is inhaled from the atmosphere diffuses through the walls of the alveoli and reaches to the adjacent capillaries into the red blood cells. It binds to haemoglobin present in red blood cells and is transported to all the tissues of the body. Carbon dioxide produced by the metabolism reaches the lung via the blood. It then diffuses across the capillary and alveolar walls into the air to be exhaled out from the body. The alveoli of the lungs have a specialized structure for efficient exchange of respiratory gases. It has extremely thin walls. It has large surface area to volume. It is surrounded by many blood capillaries.
Gas exchange in the lungs takes place at the alveolar level. Carbon dioxide diffuses across the alveolar membranes to be eliminated from the lungs during exhalation, and oxygen diffuses across the membranes in the other direction to be transported back to the heart where it is pumped out to all the body tissues.
Respiratory system
air passageway
gaseous exchange
lungs structure
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