Final answer:
The study of muscles and ligaments is rooted in Biology, specifically within the branches of Anatomy and Physiology. Knowledge of both is essential for understanding how these structures function and are composed.
Step-by-step explanation:
The roots for muscles and ligaments primarily derive from Biology (Anatomy). In the context of human anatomy, the location of a muscle's insertion and origin can determine its action, the force of contraction, muscle name, and the load a muscle can carry. Biology encompasses multiple branches, including physiology which focuses on the functions of an organism's body parts, as well as other branches such as biochemistry which informs us about what our flesh and bones are made up of and how they function. Understanding the language and etymology of these anatomical terms can significantly aid in grasping the structure and functions of the human body.
Physical therapists, among other professionals, may indeed require knowledge of Physics to understand muscle contraction and the release of energy. However, anatomy and physiology are more directly related to the study of muscles and ligaments, with biochemistry providing insights into the composition and functions of these tissues.