Describe in brief the role of lungs in gaseous exchange
Answers
Oxygen and carbon dioxide are too poorly soluble in blood to be adequately transported in solution. Specialized systems for each gas have evolved to increase the quantities of those gases that can be transported in blood. These systems are present mainly in the red blood cells, which make up 40 to 50 percent of the blood volume in most mammals. Plasma, the cell-free liquid portion of blood, plays little role in oxygen exchange but is essential to carbon dioxide exchange....
Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.