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The femur is classified as a:

A.

Irregular bone

B.

Short bone

C.

Long bone

D.

Flat bone

Answer and Explanation

The Correct Answer is C

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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Related Questions

Correct Answer is D

Explanation

A. Chondrocytes:Chondrocytes maintain cartilage and are not the principal cells responsible for bone resorption in osteoporosis.
B. Fibroblasts:Fibroblasts synthesize connective tissue matrix and are not the main drivers of bone density loss.
C. Osteoblasts:Osteoblasts form new bone, and reduced rather than increased osteoblastic activity contributes to osteoporosis when bone formation lags behind resorption.
D. Osteoclasts:Osteoclasts resorb bone matrix, and increased osteoclastic activity relative to formation leads to net bone loss seen in osteoporosis.

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.

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