Question

multiple choice question

which muscle is the prime mover of inspiration?

pectoralis major
external intercostals
internal intercostals
diaphragm

Explanation:

Identify the prime mover of inspiration

Using the Diaphragm Function, Muscles of Respiration, and Prime Mover knowledge points

• The Prime Mover (agonist) is the muscle primarily responsible for producing a specific movement.
• During quiet inspiration, the Diaphragm contracts and flattens, increasing thoracic cavity volume and driving air into the lungs.
• It accounts for approximately 75% of the air movement during quiet breathing, making it the principal muscle of inspiration.
• External intercostals assist as synergists, while Internal intercostals are active during forced expiration. Pectoralis major acts only as an accessory muscle during forced inspiration.

Answer:

• Pectoralis major
• External intercostals
• Internal intercostals
• Diaphragm (Correct answer)