Massachusetts Board of Cosmetology Practice Exam

Insertion refers to the point of attachment of a muscle that is attached to the movable bone or muscle. Option A is incorrect because detachment of muscle would be the opposite of an insertion point. Option B refers to the origin of the muscle, which is the fixed attachment to a bone. Option C is incorrect because it refers to a completely different process of muscle movement, involving brain signals rather than points of attachment. Therefore, option D is the best answer choice.