Why does gas exchange in the alveolar region very rapid?

Diffusion of gases occurs in the alveolar region only and not in the other parts of respiratory system why?

Why does old car bumper change colour ?

Why does old car bumper change colour?

Explain the exchange of gases at the alveolar level.

Why does a needle have a sharp point ?

Answer the following : Why doesn't the hot gas in the stars disperse in space ?

Why is there a change in the energy of a gas when its volume changes?

Why does adsorption occur?

Why does human being have an important place in the environment?