How many bones are there in the average person's body?

Correct Answer: B

Rationale: The average adult human has 206 bones, a standard anatomical count after fetal bones fuse (e.g., sacrum). 33 is the vertebral column, 639 is muscles, and variation is minimal post-development, making '206' correct.

Correct Answer: C

Rationale: Bone elongation during growth occurs at the epiphyseal plate (growth plate), where chondrocytes undergo mitosis, producing new cartilage that is later ossified into bone. Articular cartilage covers bone ends for joint movement, the periosteum supports bone growth in width, and diploe is spongy bone in flat bones—none of these are primary sites for elongation.

Correct Answer: B

Rationale: Hemopoiesis (blood cell production) occurs in red bone marrow, abundant in spongy bone of vertebrae, ribs, and pelvis in adults. The hyoid lacks marrow, maxilla has limited marrow, and scapula has some but less than vertebrae, which are a primary site.

Correct Answer: A

Rationale: Teeth are embedded in the maxillae (upper jaw) and mandible (lower jaw) only. The palatine bones form the hard palate but do not house teeth.

Correct Answer: B

Rationale: The coracoid process, a projection on the scapula, aids shoulder stability. A fracture there involves the scapula, not the clavicle, ulna, or ribs.