Which of the following terms is most closely associated with muscles and skeleton?

The most appropriate term associated with muscles and the skeleton is "musculoskeletal." This term is specifically used to refer to the system in the body that includes both the muscles and the bones, which work together to facilitate movement and provide structure and support. The musculoskeletal system encompasses not only the muscles and skeleton but also the tendons, ligaments, and soft tissues that connect them, highlighting the integral relationship between these components.

On the other hand, while "neurologic" pertains to the nervous system and its functions, it does not directly relate to the structure and function of muscles and bones. "Neurovascular" refers to the interconnectedness of the nervous and vascular systems, which does not focus on the musculoskeletal aspects. Finally, "nutrient" relates to the substances that provide nourishment to the body rather than to the structural elements of muscles and the skeleton. Therefore, "musculoskeletal" is the term that best encompasses the relationship between muscles and the skeletal system.