Which bone protects the brain?

Correct Answer: B

Rationale: The cranium (skull’s cranial bones) encases and protects the brain. Calcium is a mineral, cerebrum and cerebellum are brain parts, not bones, making 'The cranium' correct.

Correct Answer: B

Rationale: Synovial fluid, which lubricates freely movable diarthrotic joints, is secreted by the synovial membrane lining the joint cavity. Menisci are fibrocartilage pads aiding stability, bursae are fluid-filled sacs reducing friction outside joints, and articular cartilage provides a smooth surface but doesn’t produce fluid.

Correct Answer: D

Rationale: The optic foramen, through which the optic nerve passes, is located in the sphenoid bone of the skull, near the orbit. The ethmoid, occipital, and palatine bones do not contain this structure.

Correct Answer: B

Rationale: An amphiarthrosis, like the pubic symphysis or intervertebral joints, is slightly movable and often contains a fibrocartilage disc. Synovial and diarthrotic joints (same category) are freely movable without such discs, and syndesmoses use fibrous tissue.

Correct Answer: A

Rationale: The lateral malleolus, the bony prominence on the outer ankle, is the distal end of the fibula. The tibia has the medial malleolus, while ulna and radius are forearm bones.