Which respiratory-associated muscles would contract if you were to blow up a balloon?

A) External intercostals would contract and the diaphragm would relax.
B) Diaphragm would contract, external intercostals would relax.
C) Internal intercostals and abdominal muscles would contract.
D) none of the above

Abdominal Muscles

A group of muscles in the abdomen involved in the movement of the trunk, assistance in breathing, and support of the spine, including the rectus abdominis, obliques, and transversus abdominis.

Internal Intercostals

Muscles located between the ribs that, during exhalation, decrease the volume of the thoracic cavity to expel air from the lungs.

External Intercostals

Muscles located between the ribs, aiding in the mechanics of breathing by elevating the ribcage.