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Which of the following is a primary function of the musculoskeletal system?
Filtration of waste
Support, movement, protection
Circulation of blood
Hormone production
The correct answer is: Support, movement, protection
The primary function of the musculoskeletal system is to provide support, enable movement, and offer protection to vital organs. This system consists of bones, muscles, cartilage, tendons, and ligaments that work together to maintain the body's structure and facilitate physical activities. Support is provided by the bones, which give the body its shape and stability. Movement is a result of the interaction between muscles and bones; when muscles contract, they pull on bones to produce movement at the joints. Additionally, the skeletal system offers protection to delicate organs such as the heart, lungs, and brain, shielding them from injury. The other functions listed in the options, such as filtration of waste, circulation of blood, and hormone production, are primarily associated with different systems in the body, such as the urinary, circulatory, and endocrine systems, respectively. Thus, they do not pertain to the primary roles of the musculoskeletal system, reinforcing why support, movement, and protection are the correct focus.