The major movement produced during quiet breathing is accomplished by the ________.

A) scalenes
B) diaphragm
C) external intercostals
D) internal intercostals
E) transverses thoracis

Intercostals

Muscles located between the ribs that assist with the breathing process by facilitating the expansion and contraction of the chest cavity.

Diaphragm

A large, dome-shaped muscle located below the lungs that contracts and relaxes to aid in breathing by changing the volume of the thoracic cavity.

Scalenes

A group of three muscles in the neck that assist in breathing and movement of the cervical spine.