What functions do the following muscles have? Frontalis: masseter: sternocleidomastoid: pectoralis biceps: triceps trapeze: deltoid:

The frontalis muscle is a large muscle that extends upward and laterally across the forehead. Its function is to elevate the eyebrows, usually more centrally than laterally.

The masseter muscle is a facial muscle located in the cheek area. It plays a major role in the chewing of solid foods.

sternocleidomastoid functions : Rotation of the head to the opposite side or obliquely rotate the head. It also flexes the neck.

The anterior deltoid attaches at the collarbone and allows you to flex your shoulder joint and rotate the shoulder inward. The middle deltoid attaches to the shoulder blade and allows you abduct your arm.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.