Final answer:
The movable end of a muscle that attaches to the bone during movement is called the insertion, while the fixed end attached to a stabilized bone is the origin. Option A.
Step-by-step explanation:
The more movable end of a muscle that attaches to the bone being pulled during movement is known as the muscle's insertion. The fixed end of the muscle that attaches to a stabilized bone is referred to as the origin. These terms are significant when studying the interactions and naming of skeletal muscles in the body.
The muscle's origin is generally stationary, serving as the anchor point, while the insertion moves closer to the origin during muscle contraction.
Furthermore, when looking at the naming of muscles, the location of a muscle's insertion can be reflected in its name with the origin typically named first. This helps in understanding not only the overall function of a muscle but also in predicting the action the muscle generates when it contracts.
An example of this is the sternocleidomastoid muscle, which has its origin on the sternum and clavicle and insertion on the mastoid process of the temporal bone.
So option A.