Which of the following bones listed is an example of a 'long' bone?

Correct Answer: B

Rationale: The ulna is a long bone in the forearm, characterized by a shaft (diaphysis) and ends (epiphyses), typical of long bones that support weight or enable movement. Ribs are flat, phalanges are short (despite length, they’re classified as short due to structure), and the mandible is irregular.

Correct Answer: C

Rationale: The zygomatic bone, a paired irregular bone, articulates with the maxilla and forms the cheekbone, contributing to the orbit’s structure. The palatine forms the palate, and the lacrimal is a small orbital bone, neither being the cheekbone.

Correct Answer: B

Rationale: The first seven pairs of ribs are 'true ribs,' attaching directly to the sternum via costal cartilage, forming the rib cage’s core. 'Actual' and 'real' are not anatomical terms in this context.

Correct Answer: A

Rationale: The interosseous membrane, a flexible ligament, connects the ulna and radius along their lengths, stabilizing them and allowing pronation/supination. 'Intraosseous' implies within a bone, not between.

Correct Answer: C

Rationale: The fovea capitis is a small pit in the femoral head where the ligamentum teres attaches, anchoring it in the acetabulum. Other options are different femoral features (e.g., trochanters are projections).