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The renal medulla is the innermost part of the kidney
Kidney

The kidneys are Organ that have numerous biological roles. Their primary role is to maintain the homeostasis balance of bodily fluids by filtering and secreting Metabolomics#Metabolitess and minerals from the blood and excreting them, along with water , as urine....
. The renal medulla is split up into a number of sections, known as the renal pyramids
Renal pyramids

Renal pyramids are cone-shaped biological tissues of the kidney. The renal medulla is made up of 8 to 18 of these conical subdivisions. The broad base of each pyramid faces the renal cortex, and its apex, or Renal papilla, points internally....
. Blood enters into the kidney via the renal artery, which then splits up to form the arcuate arterioles. The arcuate arterioles each in turn branch into interlobular arterioles, which finally reach the glomeruli. At the glomerulus the blood reaches a highly disfavourable pressure gradient and a large exchange surface area, which forces the serum
Serum

Serum may refer to:*Blood plasma, with clotting factors removed*Antiserum, for transfer of passive immunity*Serous fluid, any clear bodily fluid...
 portion of the blood out of the vessel into the renal tubules.






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The renal medulla is the innermost part of the kidney
Kidney

The kidneys are Organ that have numerous biological roles. Their primary role is to maintain the homeostasis balance of bodily fluids by filtering and secreting Metabolomics#Metabolitess and minerals from the blood and excreting them, along with water , as urine....
. The renal medulla is split up into a number of sections, known as the renal pyramids
Renal pyramids

Renal pyramids are cone-shaped biological tissues of the kidney. The renal medulla is made up of 8 to 18 of these conical subdivisions. The broad base of each pyramid faces the renal cortex, and its apex, or Renal papilla, points internally....
. Blood enters into the kidney via the renal artery, which then splits up to form the arcuate arterioles. The arcuate arterioles each in turn branch into interlobular arterioles, which finally reach the glomeruli. At the glomerulus the blood reaches a highly disfavourable pressure gradient and a large exchange surface area, which forces the serum
Serum

Serum may refer to:*Blood plasma, with clotting factors removed*Antiserum, for transfer of passive immunity*Serous fluid, any clear bodily fluid...
 portion of the blood out of the vessel into the renal tubules. Flow continues through the renal tubules, including the proximal tubule, the Loop of Henle
Loop of Henle

In the kidney, the loop of Henle is the portion of the nephron that leads from the proximal convoluted tubule to the distal convoluted tubule. The loop has a Hairpin turn in the renal medulla....
, and finally leaves the kidney by means of the collecting duct, leading to the renal ureter
Ureter

In human anatomy, the ureters are muscular ducts that propel urine from the kidneys to the urinary bladder. In the adult, the ureters are usually long....
.

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