Formation of the bony callus in fracture repair is followed by a. hematoma formation b. fibrocartilaginous callus formation c. bone remodeling d. formation of granulation tissue.

Video transcript

Welcome back. Everyone. Here's our next problem. It says which cells are responsible for laying down trabecula of new bone within and around the fibrocartilage callus, a osteocyte B Osteoblast C osteoclast or D fibroblast. So we're talking about which cells help to produce new bone cells around a fibrocartilage callus. So a callus forms when there's been a site of injury or fracture. So the cells that are responsible for that are choice. B osteoblasts, osteoblasts are responsible for bone formation. They secrete collagen and other materials that build new bone tissue and they're recruited to injury or fracture sites where they first form the fibro cartilaginous callus and then new bone is formed and mineralized at that point to heal an injury. So let's look at our other answer. Choices. We talked about the osteoblast joint c is the osteoclast. That's the type of cell responsible for breaking down and then the resorption of old bone. So bone is going through this continual sort of regeneration process where old bone is broken down and resorbed new bone is formed. So you've got osteoblasts and osteoclast working together essentially though doing opposite functions. So the osteoclast is not what we're looking for osteocyte are the mature bone cells. So, osteoblasts are used for forming new bone cells in that process of formation or healing. Whereas the osteocyte are those mature bone cells that are just in like the maintenance phase. So not what we're looking for. And finally, just the fibroblasts, which are not bone cells at all, but connective tissue cells. So connective cells and there they produce and they're responsible for producing the extracellular matrix of bone, but they don't form new bone. So they're not what we're looking for here. So again, those cells responsible for laying down new bone with and around the fibrocartilage is callus choice B osteoblast. See you in the next video.