Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

Explain why, when air is taken in and let out during breathing, the lu

1.	Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.
Answer» Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.