sentence2_structure: the muscular and skeletal organs<>are known as<>the musculoskeletal system
sentence1: Following an extended introduction to general anatomical, physiological and chemical organization, the skin, skeletal, muscular, digestive and endocrine systems are studied.
sentence2: Together, the muscular and skeletal organs are known as the musculoskeletal system.
question: Together, the muscular and skeletal organs are known as what?