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. And what that means is we're going to increase the amount of oxygen and nutrients that the skeletal tissue, skeletal muscle tissue will actually need. Now the question is how exactly can the body actually increase the volume flow rate to the tissue of our body that needs the increase in metabolic nutrients and oxygen? Well, one way is to increase our pressure.