And this can be seen from the following graph. So if we assume that l the length, the viscosity and the change in pressure is constant and we plot our relationship this equation, we basically get the following curve. Now the y axis is the relative volume flow rate Q and the x axis is the relative radius given by lowercase r. So from this relationship we see that even a tiny change in the radius can greatly increase the relative flow rate of our blood. Now what this means is our body can actually adjust the radius and the diameter of small arteries and arterios in order to actually meet the metabolic requirements of oxygen and nutrients that our organs and tissues of our body actually need. So to see, to demonstrate what this actually means and how our body controls the resistance and ultimately the volume flow rate, let's take a look at the following example. So let's suppose we are being chased by a dog and at the moment as we begin to run away from that dog, our skeletal muscle in our body begins to work much more vigorously.