Question

The process by which the exchange of gases in the alveoli and tissues takes place ________.

Answer 1

Diffusion:

1. Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.
2. Alveoli are functional units of the lungs and are the actual sites of gaseous exchange.
3. The walls of the alveoli are extremely thin and moist, thereby allowing gases to diffuse through them easily.
4. The alveoli are in close association with blood capillaries and provide a large surface area for gaseous exchange.

Final answer: The process by which the exchange of gases in the alveoli and tissues takes place is diffusion.