Question

arrange in the proper sequence the following events as they occur in the ossification of a long bone. 1. chondroblasts die, and the surrounding matrix breaks down. 2. osteoblasts secrete osteoid. 3. blood vessels transport osteoblasts into the area to be ossified. 4. chondroblasts create a model of long bones from cartilage. 5. osteoblasts become osteocytes. 3,2,1,5,4 4,1,3,2,5 5,2,3,1,4 4,1,5,3,2 3,2,5,4,1

Explanation:

1. The process starts with chondroblasts forming a cartilage model of the long bone (step 4).
2. The chondroblasts then die, and the cartilage matrix breaks down (step 1).
3. Blood vessels bring osteoblasts to the area (step 3).
4. Osteoblasts secrete osteoid, the organic bone matrix (step 2).
5. Finally, osteoblasts get trapped in the matrix and mature into osteocytes (step 5).

Answer:

4, 1, 3, 2, 5