What is the occipital bone?

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: Muscles consist of fibres (elongated cells) bundled together, enabling contraction. Silica is in trace amounts, polyester is synthetic, calcium/phosphorus are bone minerals, making 'groups of cells called fibres' correct.

Correct Answer: D

Rationale: A facet is a flat or shallow surface on a bone where articulation occurs, such as in vertebral joints. A tubercle is a small projection, a fossa is a depression, and a fovea is a small pit—none describe a shallow articulating surface as precisely as facet.

Correct Answer: A

Rationale: Gliding joints allow sliding movements, as seen in the intercarpal joints (between wrist bones). The radiocarpal joint is a condyloid joint, intervertebral joints are cartilaginous (amphiarthroses), and phalangeal joints are hinges—not gliding.

Correct Answer: C

Rationale: The tibia, a long bone, has a diaphysis (shaft), epiphyses (ends), articular cartilage (at joints), and a medullary cavity (marrow space). Scapula and sacrum are flat/irregular bones, and the patella (sesamoid) lacks a medullary cavity.