Which of the following is not a function of long bones?
Providing support for the body
Protecting internal organs
Producing blood cells
Facilitating movement of the body
Long bones, such as the femur and humerus, have several important functions in the body. They provide support and structure for the body, protect internal organs, and facilitate movement of the body through the attachment of muscles. However, the production of blood cells occurs in the bone marrow, which is found in the spongy tissue at the ends of long bones and in the flat bones of the body, such as the sternum and pelvis. Therefore, producing blood cells is not a function of long bones specifically, but rather a function of bone marrow. Hence, option 3 is the correct answer.