Yellow bone marrow contains a large percentage of:

Choice A reason: Synarthrotic joints are structurally designed to be immobile, often found in areas like the skull where bones are tightly joined by fibrous tissue. Because of their rigidity and lack of movement, they are not prone to dislocation.

Choice B reason: Freely movable joints are classified as diarthroses, such as the shoulder or knee. Synarthrotic joints are the opposite, offering no movement between the bones.

Choice C reason: Slightly movable joints are called amphiarthroses, such as the joints between vertebrae. Synarthrotic joints do not allow even slight movement.

Choice D reason: Synarthrotic joints are immovable joints where bones are connected by fibrous tissue or cartilage. Examples include sutures in the skull. Their primary function is protection and structural stability.

Choice A reason: Epiphysis and diaphysis refer to regions of a long bone—the ends and shaft respectively—not to the coverings of bone surfaces.

Choice B reason: This reverses the anatomical regions but still does not address the coverings of bone surfaces.

Choice C reason: Compact bone and spongy bone are types of bone tissue, not the membranes that line or cover bone surfaces.

Choice D reason: The periosteum is a dense fibrous membrane that covers the external surface of bones, providing attachment points for tendons and ligaments and housing blood vessels and nerves. The endosteum lines the internal surfaces, including the medullary cavity, and plays a role in bone growth and remodeling.

Choice E reason: This reverses the correct anatomical relationship. The endosteum lines the internal surface, not the external.