Which of the following correctly identifies the three parts of a muscle?

The three parts of a muscle are identified as the origin, insertion, and belly.

The origin of a muscle refers to the fixed attachment point that does not move during contraction. The insertion is where the muscle attaches to a bone that moves when the muscle contracts. The belly of the muscle is the central, thicker portion that generates the most force during contraction. Understanding these components is crucial for recognizing how muscles function in movement and stability.

Other options, such as identifying parts as hard, soft, and sore, or naming body parts like arm, leg, and back, do not accurately represent the anatomical structure of a muscle. Similarly, labeling the parts as front, back, and side does not define any specific elements of muscle anatomy. Thus, recognizing the correct terminology helps in both theoretical learning and practical application in fields like anatomy and massage therapy.