Multiple choice

Which of the following is a primary inspiratory muscle?

  1. Sternocleidomastoid muscle

  2. Scaleni

  3. Abdominal muscle

  4. External intercostal

  5. Anterior serratus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The muscles extend from the tubercles of the ribs behind, to the cartilages of the ribs in front, where they end in thin membranes. These muscles work in unison during inhalation. The internal intercostal muscles relax while the external muscles contract, causing the expansion of the chest cavity and an influx of air into the lungs.

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