Mitosis resulting in elongation of bone occurs at the

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: 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.

Correct Answer: D

Rationale: The pituitary gland sits in the sella turcica, a depression in the sphenoid bone. Surgery (e.g., transsphenoidal) targets this area, not the mastoid, pterygoid, or styloid processes.

Correct Answer: A

Rationale: The pinna (external ear) in mammals is supported by elastic cartilage, which provides flexibility and resilience to maintain its shape. Hyaline cartilage is rigid (e.g., nose), white fibrous tissue is dense (e.g., tendons), and calcified cartilage is hardened—elastic cartilage is uniquely suited for the pinna.