6) E
The easiest one to figure out is Y. During expiration, the diaphragm relaxes and curves upwards.
The pressure Z increases to force the air to move out of the thoracic cavity.
The intercostal muscles also relax to allow expiration.
6) E
The easiest one to figure out is Y. During expiration, the diaphragm relaxes and curves upwards.
The pressure Z increases to force the air to move out of the thoracic cavity.
The intercostal muscles also relax to allow expiration.