Question

question 3
which of the following events occurs last?
a osteoblasts produce trabeculae and lamellae on the surface of calcified cartilage
b secondary ossification centers appear in the epiphyses
c blood vessels grow into the primary ossification center
d a cartilage model is formed by chondroblasts
e cartilage is calcified in the cartilage model

Explanation:

• D: Formation of cartilage model by chondroblasts is the first step in endochondral ossification.
• E: Cartilage calcification in the model occurs after the initial model formation.
• C: Blood vessels growing into the primary ossification center happens after some cartilage changes.
• A: Osteoblasts producing trabeculae and lamellae on calcified cartilage surface is part of the ossification process but after earlier steps.
• B: Secondary ossification centers in epiphyses appear later in the overall bone - development process compared to the other events listed.

Answer:

B. Secondary ossification centers appear in the epiphyses