Question

Air leaves the tiny sacs in the lungs to pass into capillaries.what modification is needed in the statement

Answer 1

Gaseous exchange occurs in the lungs. Oxygen in the air diffuses from tiny sacs (alveoli) into the surrounding blood capillaries and carbon dioxide diffuses from the blood capillaries into the alveoli. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. The capillaries surrounding the alveoli are rich in carbon dioxide and poor in oxygen thus facilitating the exchange.