Ventilation

Lung ventilation - air exchange in the lungs, which occurs due to rhythmic inhalations and exhalations

SOURCE

INspiration - air enters the lungs, this is an active phase - it involves muscle contraction	EXpiration - air is expelled from the lungs, in a passive phase where the muscles relax
• the intercostal muscles contract	• the intercostal muscles relax
• the chest rises	• the chest goes down
• the diaphragm contracts and lowers	• the diaphragm relaxes and rises
• the volume of the chest increases	• the volume of the chest decreases