ATI RN
Multiple Choice Questions on Skeletal System Questions
Question 1 of 5
Compact bone consists of cylinder-shaped units called
Correct Answer: D
Rationale: Compact bone is organized into cylinder-shaped units called osteons (or Haversian systems—both terms are synonymous), containing lamellae and a central canal. Trabeculae are in spongy bone, not compact, so 'Both A and C are correct' reflects the interchangeable terminology.
Question 2 of 5
Place the following steps of endochondral ossification in chronological order. 1) Formation of bone collar. 2) Formation of primary center of ossification. 3) Formation of secondary center of ossification. 4) Ossification of epiphyseal plate.
Correct Answer: A
Rationale: Endochondral ossification follows: 1) bone collar forms around the cartilage model, 2) primary ossification center forms in the diaphysis, 3) secondary centers form in the epiphyses, 4) epiphyseal plate ossifies, closing growth. Thus, '1-2-3-4' is the correct order.
Question 3 of 5
The membranous regions in between the cranial bones of a fetal skull are called:
Correct Answer: A
Rationale: Fontanels are soft, membranous gaps between fetal cranial bones, allowing skull flexibility during birth and growth (e.g., anterior fontanel). Foramina are holes, sinuses are cavities, and sutures are adult joints, making 'fontanels' correct.
Question 4 of 5
The cheek bones are predominately formed by the bones.
Correct Answer: D
Rationale: The zygomatic bones form the cheeks and lateral orbit rims, contributing to facial structure. The maxillae form the upper jaw, parietal the skull top, and temporal the sides, making 'zygomatic' correct.
Question 5 of 5
Within the vertebral column there are cervical vertebrae, thoracic vertebrae and lumbar vertebrae.
Correct Answer: C
Rationale: The vertebral column has 7 cervical, 12 thoracic, and 5 lumbar vertebrae in adults, totaling 24 movable vertebrae (plus sacrum and coccyx). '7: 12: 5' matches this standard count.