The joining of bones at a joint is a(n):

Correct Answer: A

Rationale: An articulation is the point where two bones meet, forming a joint (e.g., knee). The diaphysis and epiphysis are parts of long bones, and the endosteum lines the marrow cavity, making 'articulation' the correct term.

Correct Answer: A

Rationale: Bone fracture repair occurs in four stages: 1) hematoma (blood clot) forms at the break, 2) fibrocartilage callus bridges the gap, 3) bony callus replaces it with spongy bone, 4) remodeling shapes it into compact bone. 'hematoma, fibrocartilage callus, bony callus, remodeling' is correct.

Correct Answer: A

Rationale: Cranial bones form the cranium: frontal, parietal, occipital, temporal, sphenoid, and ethmoid. The ethmoid is cranial, while nasal, vomer, and zygomatic are facial bones, making 'ethmoid' correct.

Correct Answer: B

Rationale: The maxillae form the upper jaw, supporting upper teeth and part of the palate. The mandible is the lower jaw, vomer the nasal septum, and zygomatic the cheeks, making 'maxillae' correct.

Correct Answer: A

Rationale: The sacrum in adults is 5 vertebrae fused into one bone, supporting the pelvis. The total spine has 33 vertebrae, but only 5 form the sacrum, making '5' correct.