Final answer:
The muscular system is of greatest interest to someone studying deep tissue massage because the practice involves the manipulation of muscle and connective tissue. While the nervous and circulatory systems play supportive roles, the primary focus is on the muscles. Hence, option (b) is correct.
Step-by-step explanation:
As Griffin studies how to perform a deep tissue massage, the body system that will be of the greatest interest is the muscular system. Deep tissue massage focuses on the manipulation of muscle tissue and connective tissue to reduce muscle tension and alleviate pain. Since this type of massage targets the deeper layers of muscles and fascia, understanding how muscles work, how they are structured, and how they interact with the rest of the musculoskeletal system is crucial.
While the nervous system also plays a role in massage, as it communicates signals including pain and relaxation, and the skeletal system provides the framework upon which muscles act, the primary focus for a deep tissue massage therapist is the muscles themselves. Moreover, the circulatory system is also involved in massage due to the improvement in blood flow that can result from deep tissue manipulation, which aids in recovery and the reduction of inflammation.