sentence2_structure: the muscular and skeletal organs<>are known as<>the musculoskeletal system
sentence1: The material begins with the basics of anatomical positioning (knowing your anterior from your posterior) and moves to the skeletal system, and then we'  re off and running through all the bones, onto the muscular system, the nervous system, and the sensory organs.
sentence2: Together, the muscular and skeletal organs are known as the musculoskeletal system.
question: Together, the muscular and skeletal organs are known as what?