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Key People:Carl F.W. LudwigWilliam Prout...(Show more)Related Topics:ExcretionUrineUrethraKidneyRenal artery...(Show more)

Renal system, in humans, organ system that consists of the kidneys, whereby urine is produced, and also the ureters, bladder, and urethra for the passage, storage, and also voiding the urine.

In countless respects the person excretory, or urinary, device resembles those of other mammalian species, but it has its own unique structural and also functional characteristics. The state excretory and also urinary emphasize the elimination function of the system. The kidneys, however, both secrete and actively retain in ~ the body certain substances that are as an important to survival together those that are eliminated.

The system consists of two kidneys, which control the electrolyte ingredient of the blood and also eliminate dissolved waste products and excess amounts of other substances from the blood; the latter substances room excreted in the urine, which overcome from the kidneys to the bladder by means of 2 thin muscular tubes called the ureters. The bladder is a sac the holds the urine till it is removed through the urethra.

Human excretory organs

The kidneys

General description and location

The kidneys room bean-shaped, reddish brown combine organs, concave top top one lengthy side and also convex top top the opposite. Castle are usually located high in the abdominal muscle cavity and against its earlier wall, lied on either side of the vertebral column in between the levels of the 12th thoracic and 3rd lumbar vertebrae, and outside the peritoneum, the membrane the lines the abdomen.


female kidney in situ; human being renal system
Female kidneys in situ.
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The long axes the the kidneys are aligned v that that the body, however the upper finish of every kidney (pole) is tilted slightly inward toward the backbone (vertebral column). Positioned in the middle of the medial concave border is a deep upright cleft, the hilus, which leader to a cavity in ~ the kidney recognized as the renal (kidney) sinus. The hilus is the allude of entry and also exit of the renal arteries and also veins, lymphatic vessels, nerves, and also the enlarged upper extension of the ureters.