The two kidneys of the human body are part of the system of kidneys and urinary tract. The kidneys are located in the lumbar region, on either side of the spine. Their main role is to filter the blood to get rid of waste (urea, toxins, antibiotics, etc.) and the production of urine - the result of the filtering process - which is drained by the ureters.

Of the kidney has the shape of a bean and is 1.2 inche thick, 2.4 inche wide and 4.7 inche long. Each kidney has about a million filtering units, the nephrons.

The ureter is a thin tube of 10 to 12 inche long that carries urine from the kidney to the bladder is removed.

The renal arteries carry blood to the kidneys at a rate of 1100 to 1300 ml per minute, where it is filtered, and stripped of degradation products. A kidney consists of over one million nephrons, the functional kidney units which are of great importance during filtering. Each nephron contains a glomerulus, which consists of a ball of capillaries surrounded by Bowman's capsule and renal tube. This kidney tube consists of four separate elements: the proximal tubule, the loop of Henle, distal tubule and the collecting tube.

The blood is filtered through the capillaries through the wall of Bowman's capsule in the outgoing vessel correctly. The filtrate (water and waste) is reabsorbed in the renal tubules before urine is produced. The urine is collected in the collecting tubes that lead to the summits of the renal pyramids. The product of the filtration in the renal pelvis discharged. The quantity and composition of urine changes due to the interaction between the kidney and excreted and possibly reabsorbed substances.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.