GENERAL HISTOLOGY

Detailed explanation-1: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

Detailed explanation-2: -As the alveoli is rich in oxygen and tissues are rich in carbon dioxide(as oxygen is utilized there and carbon dioxide is released as a byproduct ), the gases get exchanged by diffusion along the concentration gradient. So, the gases get interchanged in between the lung and the tissues.

Detailed explanation-3: -Gas exchange between the alveoli and blood capillaries occurs by simple diffusion. This results from the gradient created as a result of the difference in the concentration of the respiratory gases in the alveoli and capillaries.

Detailed explanation-4: -Final answer: The exchange of gases in the alveoli of the lungs takes place by simple diffusion.

Detailed explanation-5: -In the lungs, oxygen and carbon dioxide (a waste product of body processes) are exchanged in the tiny air sacs (alveoli) at the end of the bronchial tubes.