Question

The exchange of gases in the alveoli of the lungs takes place by

• A. Osmosis
• B. Simple diffusion
• C. Passive transport
• D. Active transport

Answer 1

The correct option is B Simple diffusion

Passive or simple diffusion is the movement of solutes (gas or ions) from an area of high concentration to an area of low concentration. Gases diffuse across the systemic capillary membrane and the cell membranes of the target tissue. Carbon dioxide diffuses from systemic tissues to lungs, and oxygen diffuses from lungs to systemic tissues

So, the correct answer is 'Simple diffusion'