An essential organ of the body is the lung. The passageway within the lungs separates into increasingly smaller tubes that finally come to an end in balloon-like formations known as alveoli.
The surface provided by the alveoli allows for the exchange of gases. Typically, a dense network of blood arteries can be found inside the alveoli\’s walls. We are aware that when we breathe in, the chest cavity enlarges and our ribs are lifted.
Air is drawn into the lungs asa result of this motion, filling the expanded alveoli.
The oxygen in the alveolar air is absorbed by the blood in the alveolar blood vessels to be carried to all other cells in the body, while the blood brings the necessary carbon dioxide from the rest of the body and supplies it to the alveoli. The lungs always have a residual volume of air during a regular breathing cycle when air is inhaled and exhaled so that there is enough time for oxygen to be absorbed and carbon dioxide to be expelled.