Which zone is Ossification Zone?

Which zone is Ossification Zone?

• A. Resting Zone
• B. Proliferation Zone
• C. Hypertrophic Zone
• D. Ossification Zone

Answer: (D)

The question tests knowledge of the growth plate’s zones during endochondral ossification and where bone formation happens. In the growth plate, cartilage expands and matures through several stages: resting chondrocytes sit idle in the first zone, followed by the proliferation zone where chondrocytes divide and form columns. The hypertrophic zone features enlarged chondrocytes that prepare the matrix for calcification. In the zone of ossification, calcified cartilage is invaded by blood vessels and osteogenic cells; osteoblasts lay down bone on the calcified cartilage, and cartilage is progressively replaced by bone. This makes the ossification zone the specific region where bone formation occurs, hence it’s the correct label.

The question tests knowledge of the growth plate’s zones during endochondral ossification and where bone formation happens. In the growth plate, cartilage expands and matures through several stages: resting chondrocytes sit idle in the first zone, followed by the proliferation zone where chondrocytes divide and form columns. The hypertrophic zone features enlarged chondrocytes that prepare the matrix for calcification. In the zone of ossification, calcified cartilage is invaded by blood vessels and osteogenic cells; osteoblasts lay down bone on the calcified cartilage, and cartilage is progressively replaced by bone. This makes the ossification zone the specific region where bone formation occurs, hence it’s the correct label.