ATI RN
Skeletal System Questions Questions
Question 1 of 5
Compact bone consists of cylindrical units called:
Correct Answer: C
Rationale: Osteons (or Haversian systems) are the cylindrical units of compact bone, containing lamellae, a central canal, and osteocytes. Lamellae are layers within osteons, canaliculi are channels, and trabeculae are in spongy bone, making 'osteons' the correct answer.
Question 2 of 5
Identify a bone of the appendicular skeleton.
Correct Answer: D
Rationale: The appendicular skeleton includes limbs and girdles. The coxal bone (hip) is part of the pelvic girdle, thus appendicular. Cranium, ribs, and sternum are axial skeleton components, making 'coxal bone' correct.
Question 3 of 5
The cranial bone(s) shaped like a butterfly that forms the sides and floor of the cranium is/are the bone(s).
Correct Answer: C
Rationale: The sphenoid bone, butterfly-shaped, forms the cranium’s floor and sides, housing the pituitary. The ethmoid is anterior, occipital posterior, and temporal lateral, making 'sphenoid' correct.
Question 4 of 5
The only movable bone of the skull is the:
Correct Answer: B
Rationale: The mandible (lower jaw) is the only skull bone that moves, via the temporomandibular joint, enabling chewing. The cranium, maxilla, and vomer are fixed, making 'mandible' correct.
Question 5 of 5
The ribs attach to the vertebrae.
Correct Answer: D
Rationale: The 12 pairs of ribs attach to the 12 thoracic vertebrae via costal facets, forming the thoracic cage. Cervical, lumbar, and sacral vertebrae lack rib articulations, making 'thoracic' correct.