So to maintain blood pressure, which is a ball, can we give a ballpark figure just so people know what this number is? That's a good point. We haven't spoken about blood pressure values. Should we talk about that quickly? I think very quickly. Okay. So how do we maintain blood pressure? Yeah. Whole system based. And then we could look at it, how it can be affected in local environments. All right. So globally, what's the major things that can change the diameter of a blood vessel? Well, one of the big ways of regulating blood pressure is neurologically, and you, the brain, and you measure,. But let's just quickly go over