Which is the Prime Mover or Agonist of Inspiration

Question

Which is the prime mover or agonist of inspiration?
A)Internal intercostal muscles
B)Sternocleidomastoid muscle
C)Diaphragm muscle
D)Pectoralis major muscle

Accepted Answer

The diaphragm muscle is the primary muscle responsible for inspiration, as it contracts and flattens to increase the volume of the thoracic cavity, allowing air to be drawn into the lungs.