Which of the following is NOT a function of the skeletal-muscle system?

• A. Produces blood cells
• B. Allow the body to move
• C. Produces collagen
• D. Protects organs

Answer: (A)

The musculoskeletal system’s main roles are to enable movement, provide support, and protect internal organs. Blood cell production happens in bone marrow, which is contained within bones, and is part of hematopoiesis linked to the circulatory system rather than a direct function of moving or safeguarding tissues. Because that hematopoietic activity is tied to bone tissue itself and the circulatory system, it’s considered outside the primary actions of the musculoskeletal system as a whole. The other described functions—enabling movement and shielding organs—are clear, direct duties of muscles and bones, respectively, which is why the statement about producing blood cells is the one that doesn’t fit as a core musculoskeletal function.