What are the cells that are found in the lacunae of compact bone called?

Correct Answer: A

Rationale: Osteocytes are mature bone cells in lacunae of compact bone, derived from osteoblasts. Osteons are structures, not cells. Answer is A, per the document.

Correct Answer: C

Rationale: Synovial joints have a fluid-filled cavity (synovial fluid), not discs in all, and aren’t amphiarthroses or cartilaginous. Answer is C, per the document.

Correct Answer: D

Rationale: Blood cell formation (haemopoiesis) occurs in red marrow, active in flat bones and long bone ends. Blood, endosteum, and canals don’t produce cells. Answer is D, per the document.

Correct Answer: B

Rationale: The occipital bone forms the cranium’s base, not a carpal, vertebra, or facial bone. Answer is B, per the document.

Correct Answer: D

Rationale: The skull houses and protects sense organs (e.g., eyes in orbits, ears in temporal bones) alongside the brain. Lungs and diaphragm are thoracic, cells are everywhere—not skull-protected—making 'the sense organs' correct.