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. Now, the Bowman's capsule is this cup shaped structure shown that encloses the glomerulus. The first capillary network system of the nephron. Hydrostatic pressure in the glomerulus forces some of that blood plasma that was carried by the afairy arterial to enter the Bowman's capsule.