Which of the following is not a major function of the skeletal system?
Hormone production
Mineral storage
Support and protection
Blood cell formation
The Correct Answer is A
A. Hormone production: While bone cells secrete factors (for example osteocalcin) that have endocrine effects, classical major functions of the skeleton focus on support, protection, mineral storage, and hematopoiesis rather than systemic hormone production.
B. Mineral storage: The skeleton stores minerals (notably calcium and phosphate) and helps regulate their blood levels.
C. Support and protection: The skeleton provides structural support for the body and protects vital organs (for example the skull protects the brain).
D. Blood cell formation: Hematopoiesis occurs in red bone marrow, producing red cells, white cells, and platelets.
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Related Questions
Correct Answer is C
Explanation
A. Absorb calcium for bone strength:Articular cartilage does not absorb calcium for bone strength; bone mineralization occurs within bone matrix, not articular cartilage.
B. Anchor ligaments:Ligaments attach near bone and into periosteum; anchoring is not the main function of articular cartilage.
C. Provide frictionless movement between bones:Articular cartilage provides a smooth, low-friction surface and helps distribute loads to permit painless joint movement.
D. Connect muscles to bones:Tendons connect muscles to bones; articular cartilage does not serve this role.
Correct Answer is C
Explanation
A. Irregular bone:Irregular bones have complex shapes (for example vertebrae) and do not describe the long, cylindrical femur.
B. Short bone:Short bones are roughly cube-shaped (for example carpals) and do not apply to the femur.
C. Long bone:Long bones are elongated with a shaft and two ends, which describes the femur as the prototypical long bone.
D. Flat bone:Flat bones are thin and plate-like (for example the sternum and skull bones) and are not the shape of the femur.
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