A joint cavity filled with fluid gives synovial joints their freedom of movement.

Correct Answer: A

Rationale: Synovial joints (e.g., knee) have a cavity with synovial fluid, reducing friction and enabling free movement. This is accurate, making 'True' correct.

Correct Answer: D

Rationale: The shape function defines the body’s form (e.g., height, width), varying with growth. A is support, B is blood production, and C is protection, making 'The skeleton gives the body shape, which changes with growth and makes you tall or short' the shape function.

Correct Answer: B

Rationale: The wrist (radiocarpal joint) is a condyloid joint, allowing flexion, extension, abduction, and adduction. Pivot is rotation (e.g., neck), saddle is thumb, and gliding is sliding, making 'Condyloid' correct.

Correct Answer: C

Rationale: Osteocytes reside in lacunae, small spaces within the lamellae of osteons in compact bone, extending processes into canaliculi for nutrient exchange. Osteons are the units, canaliculi are channels, and lamellae are layers. Answer is C, per the document.

Correct Answer: D

Rationale: Sesamoid bones (e.g., patella) ossify within tendons, enhancing leverage. Sphenoid and ethmoid are cranial, hyoid is free-floating—none are in tendons. Answer is D, per the document.