Wolff's law is concerned with a. calcium homeostasis of the blood b. the shape of a bone being determined by mechanical stresses placed on it c. the electrical charge on bone surfaces.

Video transcript

Hi, everyone. Welcome back. Here's our next question. Which of the following laws demonstrates that bones will change over time in response to mechanical stress in order to grow stronger and more resilient. A all or none. Law B. Char Gaffs Law C Hook's Law or D Wolf's Law. So the law that demonstrates that bones can change over time in response to mechanical stress is choice. The Wolf's Law. Wolf was an anatomist who discovered this. The correlation to this is with increased mechanical stress. So I'll put a little up arrow increased mechanical stress, bones become stronger but vice versa, with decreased mechanical stress, they become weaker and this can happen from a bed rest or mobilization. So that can cause bones to become weaker. We'll take a quick look at our other laws to be thorough here. Choice. A the all or none law talks about the response of a neuron or muscle fiber saying that they will either be fully activated or not at all. That's where the phrase all or none comes from, but that's what we not what we're looking for. So we cross that off choice B. Char Gas law is a law about the composition of DNA. And it says that in DNA, the amount of A must equal the amount of T, the amount of C must equal the amount of G, but definitely not what we're looking for. And finally, in Jo C Hooks Law, this is a law of physics and has to do with the force to compress or to extend the spring is directly proportional to the distance it's being compressed or extended. So again, definitely not what we're looking for here. So we cross that off. So the law that demonstrates that bones change over time in response to mechanical stress is choice D Wolf's, we'll see you in the next video.