In compact bone, the concentric rings of matrix laid down around a central canal form a structure called
Correct answer: A. a Haversian system
- A. a Haversian system
- B. a sarcomere
- C. a lacuna
- D. the periosteum
Explanation
A Haversian system, or osteon, is the cylindrical unit of compact bone: rings of hard matrix around a canal carrying a blood vessel and a nerve, with osteocytes trapped in small spaces called lacunae between the rings. The lacuna is therefore part of the system rather than the system itself. The periosteum is the fibrous sheath on the outside of the bone.
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The human skeleton provides support, protects organs, enables movement with muscles and stores minerals while bone marrow produces blood cells. Questions cover the axial and appendicular skeleton, types of bones and joints, cartilage, ligaments and tendons, and the difference between fixed, slightly movable and freely movable joints.
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