In endochondral ossification, which zone is characterized by hypertrophic chondrocytes that prepare the matrix for mineralization?

In endochondral ossification, which zone is characterized by hypertrophic chondrocytes that prepare the matrix for mineralization?

• A. Resting (reserve) zone
• B. Proliferation zone
• C. Calcification zone
• D. Hypertrophy zone

Answer: (D)

In endochondral ossification, the hypertrophy zone is where chondrocytes enlarge (hypertrophy). These enlarged cells remodel the surrounding matrix and produce signals that promote mineral deposition, effectively preparing the cartilage for calcification. After hypertrophy, the chondrocytes die and the matrix becomes mineralized, setting the stage for invasion by blood vessels and bone-forming cells. So the zone with hypertrophic chondrocytes preparing the matrix for mineralization is the hypertrophy zone. Resting is quiet and inactive, proliferation contains actively dividing chondrocytes, and the calcification zone is where mineral deposition actually occurs and cells die.

In endochondral ossification, the hypertrophy zone is where chondrocytes enlarge (hypertrophy). These enlarged cells remodel the surrounding matrix and produce signals that promote mineral deposition, effectively preparing the cartilage for calcification. After hypertrophy, the chondrocytes die and the matrix becomes mineralized, setting the stage for invasion by blood vessels and bone-forming cells. So the zone with hypertrophic chondrocytes preparing the matrix for mineralization is the hypertrophy zone. Resting is quiet and inactive, proliferation contains actively dividing chondrocytes, and the calcification zone is where mineral deposition actually occurs and cells die.