Question

what is the correct sequence of steps in bone repair? 1. cartilage in the external callus is replaced by bone. 2. a hematoma occurs. 3. an internal callus forms at the site of injury. 4. osteoclasts and osteoblasts remodel the bone at the site of repair. 3 - 1 - 4 - 2 4 - 2 - 3 - 1 2 - 1 - 3 - 4 1 - 2 - 3 - 4 2 - 3 - 1 - 4

Explanation:

When a bone is injured, first a hematoma (a mass of clotted blood) occurs due to damaged blood - vessels. Then an internal callus forms at the injury site. After that, cartilage in the external callus is replaced by bone. Finally, osteoclasts and osteoblasts remodel the bone at the repair site.

Answer:

E. 2 - 3 - 1 - 4