Ventilation

Ventilation is the process in which the lungs are .

	Inhalation	Exhalation
Ribs	Move out and up	Move down and in
Diaphragm	Contracts and Sinks	Relaxes Rises
	This increases the size of the thorax, the pressure, making air rush into the lungs to fill the gap	This decreases the size of the thorax, the pressure, squeezing the air out of the lungs