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The kidneys are bean-shaped excretory organs in vertebrates. Part of the urinary system, the kidneys filter wastes (especially urea) from the blood and excrete them, along with water, as urine. The medical field that studies the kidneys and diseases affecting the kidney is called nephrology, from the Greek name for the kidney; the adjective meaning "kidney-related" is renal, from the Latin.

In humans, the kidneys are located in the posterior part of the abdomen. There is one on each side of the spine; the right kidney sits just below the liver, the left below the diaphragm and adjacent to the spleen. Above each kidney is an adrenal gland (also called the suprarenal gland). The asymmetry within the abdominal cavity caused by the liver results in the right kidney to be slightly lower than the left one.

The kidneys are retroperitoneal, which means they lie behind the peritoneum, the lining of the abdominal cavity. They are approximately at the vertebral level T12 to L3, and the right kidney usually lies slightly lower than the left in order to accommodate the liver. The upper parts of the kidneys are partially protected by the eleventh and twelfth ribs, and each whole kidney is surrounded by two layers of fat (the perirenal fat and the pararenal fat) which help to cushion it. In very rare cases, it is possible to have developed three kidneys.

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New blog post: The Renal Care and Hypertension Unit in San Mark Hospital http://bit.ly/5SX3Zh
tabethapa (Tabetha Parney) Mon, 04 Jan 2010 11:51:56 -0000
New blog post: The Renal Care and Hypertension Unit in San Mark Hospital http://bit.ly/5SX3Zh
@Opiado calculo de "calculo renal" o del de las derivadas, integrales y demases??
RodolfoT (Rodolfo Troncoso) Mon, 04 Jan 2010 11:45:12 -0000
@Opiado calculo de "calculo renal" o del de las derivadas, integrales y demases??
[-- Salud] La Noticia del Día 04/01/2010: La insuficiencia renal podría aumen... http://ff.im/-dLnpf
r3team (R3 Team) Mon, 04 Jan 2010 11:36:28 -0000
[-- Salud] La Noticia del Día 04/01/2010: La insuficiencia renal podría aumen... http://ff.im/-dLnpf
A Case Of Bone, Lung, Pleural And Liver Metastases From Renal Cell Carcinoma Which Responded Remarkably Well To Zoledr... http://mnt.to/3vS7
mnt_cancer (MNT Cancer News) Mon, 04 Jan 2010 11:07:36 -0000
A Case Of Bone, Lung, Pleural And Liver Metastases From Renal Cell Carcinoma Which Responded Remarkably Well To Zoledr... http://mnt.to/3vS7
A Case Of Bone, Lung, Pleural And Liver Metastases From Renal Cell Carcinoma Which http://tinyurl.com/ydjwfmk
TheGivingForest (The Giving Forest) Mon, 04 Jan 2010 10:59:27 -0000
A Case Of Bone, Lung, Pleural And Liver Metastases From Renal Cell Carcinoma Which http://tinyurl.com/ydjwfmk
cólica renal, nngm merece...
ichigofields (Natalya) Mon, 04 Jan 2010 10:36:32 -0000
cólica renal, nngm merece...

 
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