Which of the following is not part of the skeletal system?

The skeletal system is comprised of various components that support, protect, and structure the body. Bones are the primary framework of the skeletal system, and they also contain bone marrow, which is critical for producing blood cells. Ligaments are connective tissues that connect bones to other bones at joints, providing stability. Tendons, on the other hand, connect muscles to bones, facilitating movement.

Blood, while essential for overall health and functioning of the body, is not a part of the skeletal system. Instead, it circulates throughout the body within the cardiovascular system and plays roles in transporting nutrients, gases, and waste products. Therefore, recognizing blood as something separate from the tissues and components that make up the skeletal system clarifies why it is not included within that system.