Synovial fluid that lubricates a diarthrotic joint is produced by the

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: 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.

Correct Answer: A

Rationale: Fascia is a broad sheet of connective tissue that surrounds and holds together entire skeletal muscles or groups of muscle bundles (fascicles). Perimysium surrounds individual fascicles, endomysium wraps individual muscle fibers, and aponeurosis is a flat tendon-like structure—none of these are the common outer layer like fascia.

Correct Answer: B

Rationale: The primary inorganic component of vertebrate bone is calcium phosphate (in the form of hydroxyapatite), providing strength and rigidity. Calcium carbonate is minor, potassium hydroxide isn’t a bone component, and ‘none of the above’ is incorrect since calcium phosphate is present.