Gaseous exchange of oxygen and carbon dioxide between alveolar air and capillaries takes place by
(a) active transport
(b) diffusion
(c) carrier-mediated transport
(d) imbibition
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Gaseous exchange of oxygen and carbon dioxide between alveolar air and capillaries takes place by
(a) active transport
(b) diffusion
(c) carrier-mediated transport
(d) imbibition
Gaseous exchange of oxygen and carbon dioxide between alveolar air and capillaries takes place by
(a) active transport
(b) diffusion
(c) carrier-mediated transport
(d) imbibition
Answer is : (b) diffusion
Gaseous exchange occurs at the alveoli in the lungs and takes place by diffusion. The alveoli are surrounded by capillaries so, oxygen and carbon dioxide diffuse between the air in the alveoli and the blood in the capillaries. Diffusion is the movement of gas from an area of high concentration to an area of low concentration.