Which one of following statements best describes 'Extension' movement at a joint?

Correct Answer: C

Rationale: Extension is straightening a joint, increasing the angle (e.g., extending the arm). A is rotation, B is adduction, and D is flexion, making 'Straightening limbs at a joint' the best description.

Correct Answer: C

Rationale: The mandible’s temporomandibular joint (with the temporal bone) is synovial, allowing chewing/speaking. Sphenoid, maxilla, and hyoid lack synovial joints (sutures or none). Answer is C, per the document.

Correct Answer: B

Rationale: Appendicular skeleton includes limbs/girdles: clavicle, fibula, metatarsal, phalange, radius are all appendicular. Ethmoid, coccyx, occipital, sternum, mandible are axial. Answer is B, per the document.

Correct Answer: C

Rationale: A trabeculum (trabeculae) is an internal structure in spongy bone, not a surface projection. Trochanter, tubercle, and tuberosity are projections. Answer is C, per the document.

Correct Answer: D

Rationale: A facet is a flat projection for articulation (e.g., vertebral facets). Fossa (depression), fissure (slit), and foramen (hole) are not projections. Answer is D, per the document.