Question

The exchange of gases in human beings takes place in-

• A. In skin
• B. In mouth
• C. In nostrils
• D. In lungs.

Answer 1

Answer: (D)

In lungs.

• 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 associated with the walls of the alveoli.
• So, the correct answer is lungs".