And this capillary system also acts to basically absorb and secrete some of the things found between this vessel here, this cubial, and this blood vessel here. Now, once the oxygenated blood, or once the oxygen is taken up by the cells, the deoxygenated blood is carried away by these venues and eventually into our circulatory system. So only about 20% of the blood is filtered into the Bowman's capsule from the glomerulus. The rest goes into the efair and arterio and then travel to the second network of capillaries known as the Vasa rectan. Now, because we have two sets of different capillaries, the glomerulus and the Vasa rectum, this is an example of a portal system. So the kidney contains a network of two different capillaries.