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The original can be viewed here: Kidney nephron molar transport diagram.png: . Modifications made by Mcstrother . To modify the text of this drawing, read the content of this link .
The nephron is the minute or microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule . The renal corpuscle consists of a tuft of capillaries called a glomerulus and a cup-shaped structure called Bowman's capsule .
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English: A modern illustration of the basic physiology of a nephron within a kidney. The labels are: 1. Glomerulus, 2. Efferent arteriole, 3. Bowman's capsule, 4. Proximal tube, 5.
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The nephron by itself is similar to pronephros as a whole organ. [18] The simplest nephrons are found in the pronephros, which is the final functional organ in primitive fish . [ 19 ] The nephrons of the mesonephros, the functional organ in most anamniotes called opisthonephros , [ 20 ] are slightly more complex than those of the pronephros. [ 19 ]
Ions such as sodium, chloride, potassium, and calcium are easily filtered, as is glucose. Proteins are not passed through the glomerular filter because of their large size, and do not appear in the filtrate or urine unless a disease process has affected the glomerular capsule or the proximal and distal convoluted tubules of the nephron.
Each nephron begins in a renal corpuscle, which is composed of a glomerulus enclosed in a Bowman's capsule. Cells, proteins, and other large molecules are filtered out of the glomerulus by a process of ultrafiltration , leaving an ultrafiltrate that resembles plasma (except that the ultrafiltrate has negligible plasma proteins ) to enter Bowman ...