Blood from the aorta reaches the kidneys so it can be filtered and cleaned. Among other functions, the kidneys remove toxins, metabolic waste, and excess ions from the blood which leaves the body in the form of urine.
Update Date 5/12/2014
Updated by: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.