They have a very thick layer of muscle within our tunica media layer of that artery. So large arteries and smaller arteries, they basically have a relatively high hydrostatic pressure because of this reason. Now, if we take a look at the following diagram, this is exactly what the diagram describes. The y axis is the pressure given in millimeters of mercury and the x axis basically are the different types of blood vessels. So if we look at our largest artery array order and the smaller ones are arteries this is where our pressure is at a highest value. Now, when we go from the arteries to the tiniest arteries called arterioles we have a very sharp drop in blood pressure as shown by the slope of this line.