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A perfect circle is an ellipse with an eccentricity of:
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.
Transverses Thoracis
A thin muscle found within the front wall of the chest, part of the internal thoracic wall muscles, contributing to the movement of the thoracic cage.
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