Rib pairs 11 and 12 are the true ribs.

Correct Answer: B

Rationale: True ribs (vertebrosternal, 1-7) attach directly to the sternum. Ribs 11-12 are floating (vertebral), with no sternal connection, making 'False' correct.

Correct Answer: A

Rationale: Shrugging raises the shoulders, an elevation movement of the scapulae. This is correct, making 'True' the answer.

Correct Answer: A

Rationale: The upper leg (thigh) contains the femur, the longest bone, from hip to knee. The fibula and tibia are lower leg bones, and the radius is in the forearm, making 'Femur' the correct answer.

Correct Answer: A

Rationale: Sesamoid bones (e.g., patella) are embedded in tendons, absorbing impact and protecting tendons during flexion (e.g., knee movement). B, C, and D apply to other bone types, making 'Absorb impact forces and protect tendons as they flex' correct.

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.