Identify the bones that form the pectoral girdle.

Correct Answer: A

Rationale: The pectoral girdle, supporting the upper limbs, comprises the scapulae (shoulder blades) and clavicles (collarbones). Radii/ulnae are forearm, coxal bones are pelvic, and tibiae/fibulae are leg, making 'Scapulae and clavicles' correct.

Correct Answer: B

Rationale: The pelvis includes two coxal bones (hips), the sacrum, and coccyx, forming a ring supporting the lower body. Scapulae, clavicles, and sternum are pectoral, making 'coxal bones, sacrum, and coccyx' correct.

Correct Answer: B

Rationale: Cartilaginous joints (e.g., vertebrae via discs, rib-sternum via costal cartilage, pubic symphysis) use cartilage. Tooth sockets (gomphosis) are fibrous joints, not cartilaginous, making 'between a tooth root and its socket' correct.

Correct Answer: D

Rationale: Bowing involves flexion, bending joints (e.g., knee, hip) forward. Extension straightens, abduction moves away, and adduction moves toward the midline, making 'flexion' correct.

Correct Answer: B

Rationale: Blood cells are produced in red bone marrow, primarily in flat bones and epiphyses of long bones. Yellow marrow, mostly fat, does not produce blood cells in adults, making 'False' correct.