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. 4 - 2 - 3 - 1 1 - 2 - 3 - 4 3 - 1 - 4 - 2 2 - 1 - 3 - 4 2 - 3 - 1 - 4

Explanation:

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

Answer:

2 - 3 - 1 - 4