Compare and contrast controls of bone remodeling exerted by hormones and by mechanical and gravitational forces, including the purpose of each control system and changes in bone architecture that might occur.

Video transcript

Welcome back. Our next question says which of the following is a process by which bone tissue is constantly broken down and rebuilt in response to mechanical stress and hormonal signals. Choice. A bone formation. B, bone growth C bone remodeling or D bone repair. And the key here is that we're talking about a process in which you have both processes happening, bone being broken down and bone being rebuilt. And that process is choice c bone remodeling. And this is a normal healthy process. Obviously, if it gets out of balance, it can be a problem, but it helps to keep bones strong over the course of a lifetime choice. A bone formation is part of bone remodeling. It's one half of it. Obviously, it could be because bone formation would be the production of new bone tissue. And that would be done by osteoblasts which are obviously part of bone remodeling. But we need the process that involves both breakdown and repair. So that's why choice A is not correct. Choice. B says bone growth and this would be the process when bones increase in size and mass. And quite logically, this happens mainly in childhood and adolescence as people grow. But that's not what we're talking about. So we'll cross out Choice B and then finally, choice D bone repair. And this is when bone tissue is restored after injury or fracture. So, not quite the same as bone remodeling because that involves actually the bone tissue being deliberately broken down and rebuilt as opposed to fixing something after a accidental injury. So choice D not the correct answer. So again, that process that involves bone tissue being constantly broken down and rebuilt in response to mechanical stress and hormonal signals. Choice C bone remodeling. See you in the next video.