Correctly order the following key steps in the process of endochondral ossification. 1. Chondrocytes die.
2) Osteoblasts build the bone collar on the external surface of the bone.
3) Perichondrium is invaded by blood vessels.
4) In the primary ossification center, osteoblasts replace calcified cartilage with early spongy bone.
5) Perichondrial cells differentiate into osteogenic cells then into osteoblasts.
A) 3, 5, 2, 1, 4
B) 3, 1, 2, 3, 5
C) 4, 3, 2, 1, 5
D) 3, 1, 4, 5, 2

Question

Quizplus · Accepted Answer

The correct order of steps in endochondral ossification is: blood vessels invade the perichondrium (3), perichondrial cells differentiate into osteogenic cells and then into osteoblasts (5), osteoblasts build the bone collar (2), chondrocytes die (1), and osteoblasts replace calcified cartilage with early spongy bone in the primary ossification center (4).

Correctly Order the Following Key Steps in the Process of Endochondral