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Cross-bridges are portions of

Bonus Which muscle is a powerful agonist of adduction and medial rotation of the arm?

Bonus What is the action of flexor carpi ulnaris?

Bonus Which muscle is an antagonist to the gastrocnemius muscle?

A twisting motion of the foot that turns the sole of the foot outward is known as

A muscle producing peak tension with rapid cycles of contraction and relaxation is said to be in

At peak levels of muscle exertion the mitochondria can supply

Bonus Which of these muscles is NOT located in the head:

Bonus Which muscle is the agonist for sitting up?

Bonus The muscle that retracts and elevates the upper lip is the ________ muscle.