Adductor magnus
When a muscle contracts, it pulls with a force generated by the muscle fibers contracting and shortening.
foreheadThe corrugator is the muscle that contracts the forehead into wrinkles and pulls the eyebrows together.
latissimus dorsi pulls inferiorly, the lower trapezius pull back. Depends on the movement.
it hurts
an erection
The muscle responds and pulls on a bone by way of a tendon. It can not react until the nerve tells it to.
Diaphram
shoulder
The muscle responds and pulls on a bone by way of a tendon. It can not react until the nerve tells it to.
you have then stretched your tendon / muscle beyond the normal range .
When one muscle pulls, the other muscle relaxes.
The muscle responsible for adducting the scapulae and helping to extend the neck is the trapezius. This large muscle spans the upper back and neck, and its upper fibers are particularly involved in neck extension and scapular adduction. When the trapezius contracts, it pulls the scapulae together while also allowing for neck extension.