Water is reabsorbed in the loop of Henle and brought back to the blood capillaries around the loop of Henle. Therefore, the network of blood capillaries surrounding the loop of Henle will have more water.The longer the loop of Henle, as in camels, the greater the water re-absorption. This means that longer the loop of Henle, the more concentrated the urine.The hormone, anitdiuretic hormone(ADH), works here to increase water reabsorption in the loop of Henle. On the other hand, a diuretic substance like caffeine will decrease the reabsorption of water in the loop of Henle to increase the volume of urine.
2006-11-24 20:36:26
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answer #1
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answered by Ishan26 7
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Blood enters the Bowman’s capsule and separates into a glomerulus ( capillary network ) by way of the afferent artery.
Blood pressure pushing in [ glomerular ( blood) hydrostatic pressure] is 55mm Hg and pressure pushing back is the capsular hydrostatic pressure ( 15 mm Hg) and the Blood Colloid Osmotic pressure ( 30 mm Hg). The difference in pressure is 10 mm Hg pushing the waste material through the walls of the glomerulus.
(55-45=10mm Hg)
This is the main reason filtration occurs-> greater pressure !
This pressure pushes the waste through fenestrations in the glomerulus through the pedicels of the podocytes that surround
the glomerulus.
Water and solutes pass from Bowman’s capsule into the
proximal convoluted tubules ( water and almost all glucose and amino acids are reabsorbed here ). The remaining solutes and water pass into the loop of Henle (water and sodium are
reabsorbed here) and then into the distal convoluted tubules
(water. sodium, anions are reabsorbed here). The waste ( water, salt, urea and nitrogen wastes) is then passed into the
collecting (ducts) tubules --> papillary ducts-->renal pelvis--> ureters--> urinary bladder-->urethra---> out of the body ! ! !
Total daily filtrate is about 180 litres of which 99% is
reabsorbed into the blood so only about 1 litre is filtered out daily.
most water and solutes are reabsorbed by the proximal tubule, including almost all glucose and amino acids
Most reabsorption is by active transport ( takes ATP )
= the proximal tubule has obligatory reabsorption controlled by physical processes ( salt and water )
= the distal tubule of the kidney has facultative reabsorption of sodium
= the distal absorption is physiologically adjusted to need
2006-11-24 12:19:18
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answer #2
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answered by ashish.prshr 2
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Blood undergoes purification by the elimination of wastes in the kidney. After glomerulus thin and fine particles of urea and sodium are in the blood. In the glomerulus blood undergoes semi permiable filtratration and in loop of henle it undergoes selective filtration after the elimination of wastes is complet. Blood get on to a common channel and then it goes back to the heart.
2006-11-24 11:50:58
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answer #3
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answered by ganesh 1
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to be precise, there SHOULD NOT BE ANY BLOOD in the loop of Henle. what should normally be there is the filtrate which has come from the bowman's capsule. then it undergoes selective re absorption and the waste is sent out as urine through the ureter.
2006-11-24 14:00:44
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answer #4
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answered by Anonymous
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http://www.rpi.edu/dept/chem-eng/Biotech-Environ/Projects00/memfilt/kidneys.htm
This website will give you info and pics of urine filtration.
You should not have blood in the Loop of Henle, only the filtrate. Any blood in the Loop will also be in your urine, which is a bad thing.
2006-11-24 13:17:35
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answer #5
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answered by drewbear_99 5
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madame curie......... ur questn is wrong as the blood never enters the loop of henle, it is the filterate of blood (can call it impure plasma) that enters into loop of henle......... here, the urine or filterate of blood is concentrated by the osmolarity difference......... first water is taken out from descending loop of henle and then NaCl from the ascending arm......
2006-11-25 07:49:21
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answer #6
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answered by Anirudha A 1
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Wow, great answers. I say amen. urine is actually an ultra filtrate or blood.
2006-11-25 16:32:49
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answer #7
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answered by ? 7
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i guess it is recirculated after that
2006-11-24 12:20:56
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answer #8
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answered by arch v21 2
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