The end of a long bone is the

Correct Answer: C

Rationale: The epiphysis is the end of a long bone, containing spongy bone and red marrow, articulating with other bones. The diaphysis is the shaft, the endosteum lines the medullary cavity, and the periosteum covers the exterior, making 'epiphysis' the correct answer.

Correct Answer: D

Rationale: Osteoclasts are specialized cells that resorb or break down bone tissue, aiding in remodeling and calcium release. Osteoprogenitor cells are stem cells, osteoblasts build bone, and osteocytes maintain it, making 'osteoclasts' correct.

Correct Answer: C

Rationale: Older people require greater vitamin D and calcium intake to maintain bone density, as absorption decreases and osteoporosis risk rises with age. Younger individuals need less supplementation due to higher efficiency, making 'greater than' likely correct (incomplete options assumed).

Correct Answer: B

Rationale: The occipital bone forms the posterior skull base and back, including the foramen magnum. The ethmoid is anterior, parietal is lateral, and sphenoid is central, making 'occipital' correct.

Correct Answer: D

Rationale: The nasal septum is formed by the vomer (lower part) and the perpendicular plate of the ethmoid (upper part), dividing the nasal cavity. Nasal bones are external, making 'vomer; ethmoid' correct.