So the renal artery delivers oxygenated blood to the kidneys and it splits and it subdivides into these very tiny blood vessels known as APA arterios. And these are the blood vessels that bring the blood, the oxygenated blood to each one of these nephrons found along the entire medulla and cortex of the kidney. So if this is our nephron, this is our a ferrint arterial that ultimately comes from the renal arteries. So it brings that blood plasma hydrostatic pressure pushes some of that blood plasma, including our excretory waste products, from this glomerulus into the Bowman's capsule and eventually through this entire system into the collecting duct and then into the ureter, into the bladder and eventually outside of our body. Now, this blood vessel is also an oxygenated blood vessel, but it is known as the etherrin arterio. So we have the Afarin and the efharin arterio and this brings our oxygenated blood to a second system of capillaries known as the vasa recta.