Breathing in (inspiration) and breathing out (expiration)

Breathing In The intercostal muscles contract and pull the rib cage up and out. The diaphragm contracts causing it to flatten. The chest cavity gets larger causing pressure in the lungs to fall. Air moves into the lungs from the higher outside pressure

Breathing in (inspiration) and breathing out (expiration)

VO2 Max – the maximum amount of oxygen your body can take in and use in one minute.

Trachea (wind pipe) Ribs Alveoli

Bronchioles Intercostal muscles

Bronchus

Residual Volume – the air left in the lungs after you have breathed out as hard as possible.

Lung

Diaphragm

Vital Capacity – the maximum amount of air you can breathe out after breathing in as much air as possible.