Which of the following is not a muscle of forced expiration?

A) Interosseous portion of the internal intercostals
B) Rectus abdominis
C) Pectoralis minor
D) External oblique
E) All of these are muscles of forced expiration.

Interosseous Portion

The portion of a limb or organ where two or more bones are joined by connective tissue, aiding in stability and movement.

Rectus Abdominis

A major abdominal muscle that extends along the front of the abdomen, helping in movements and maintaining posture.

Forced Expiration

The active process of exhaling air out of the lungs using the abdominal and other respiratory muscles, beyond normal passive breathing.