So the relationship is given by this equation. So our upper case R. The resistance of the blood vessel is equal to eight multiplied by the viscosity multiplied by the length of that blood vessel divided by pi multiplied by R raised to the power of four. Now, from this equation, we see that the resistance depends directly on the viscosity and on the length. So if we increase the length or if we increase our viscosity, we increase the resistance of our blood vessel. But by increasing our radius, we basically increase the denominator, and that decreases our resistance. So we see we have an inverse relationship between our resistance and our radius.