What is the rear-most projection of a vertebra known as?

Correct Answer: B

Rationale: The spinous process is the rear-most projection of a vertebra, extending from the vertebral arch for muscle and ligament attachment. 'Spine' is too general, and 'spinal' is an adjective, not the structure’s name.

Correct Answer: B

Rationale: Each hip bone (os coxa) in an adult is formed by the fusion of three bones: ilium, ischium, and pubis, which unite at the acetabulum during development.

Correct Answer: B

Rationale: The hallux (big toe) has 2 phalanges (proximal and distal), like the thumb, unlike the other toes, which have 3 (proximal, middle, distal), due to its structural role.

Correct Answer: B

Rationale: Osteoclasts are specialized cells that break down (resorb) bone tissue, releasing minerals like calcium into the bloodstream during remodeling or repair. Osteoblasts build bone, hematopoietic cells in marrow produce blood, and chondroblasts form cartilage—none match 'osteoclast.'