Loop of henle, Biology

Assignment Help:

Loop of Henle

The reduced volume of fluid from the proximal tubule, still isosmotic to blood, enters the descending limb of Henle's loop. As the fluid passes down the descending limb, it enters re3ions where the tubular walls are surrounded by interstitial fluid of increasing osmotic and Na+ concentration. The walls of the descending limb are permeable to water and salts. So, water leaves and sodium enters the tubular fluid so that as it descends the loop of Henle, the fl lid becomes progressively more concentrated and hyperosmotic to blood. There is also perhaps some inward diffusion of urea from a urea-rich interstitial space. As a result of these events, the tubular fluid, at any given level in the descending limb, maintains isosmotic relationship to the surrounding interstitium.

The tubular fluid from the descending loop of Henle passes through the hair-pin bend of the loop, and enters the ascending limb of Henle's loop. The walls of ascending loop do not permit diffusion of water and salts. However, the cells of these walls, particularly of the deeper parts of the ascending limb, actively transport Na+ outward. Recent studies reveal that it is Cl- which is actively transported out of the ascending limb and Na+ accompanies as the counter-ion. In this part there may also be some active transport of urea out of the tubular fluid. Because of this active transport out of the tubule, the fluid becomes progressively more dilute as it moves up the ascending limb. Since ascending limb is impermeable to water, there is no entry of water into the tubular fluid from the surrounding interstitium. Due to the net withdrawal of solute, the fluid at any given level in the ascending limb is hypoosmotic to the fluid in the interstitium as well as the descending limb.


Related Discussions:- Loop of henle

Explain the phylum molluska - mollusks, Explain the Phylum Molluska - Mollu...

Explain the Phylum Molluska - Mollusks? You are probably very familiar with members of this phylum. The mollusks include the octopuses, squids, cuttlefish, scallops, oysters, c

What is a biologic failure, What is A biologic Failure A biologic Fail...

What is A biologic Failure A biologic Failure can be defined as the inadequacy of the host to establish or to maintain osseointegration. The inability to establish osseoint

Why are shapes of squamous cells different, How do the cheek and onion cell...

How do the cheek and onion cells visually resemble one another, and why are shapes of squamous cells so different than the onion cells?

Explain about the texturization, Explain about the Texturization? Prote...

Explain about the Texturization? Proteins constitute the basis of structures and texture in several foods, whether these come from living tissue (myofibrills in meat or fish) o

Explain in brief about the trail making test, Explain in brief about the Tr...

Explain in brief about the Trail Making Test In part A of this procedure the subject must connect in order a series of circled numbers randomly scattered over a sheet of 81\2 X

Zoonotic diseases-influenza, Influenza Influenza is an acute infectious di...

Influenza Influenza is an acute infectious disease caused by influenza viruses of genus Orthomyxovirus in family Orthomyxoviridae. The name Influenza is derived from an Italian ph

The codon gca specifies which amino acid, Use the genetic code table Assign...

Use the genetic code table Assignment34 The codon GCA specifies which amino acid?

What is tricuspid atresia: surgery for single ventricle, What is Tricuspid ...

What is Tricuspid Atresia: Surgery for Single Ventricle Physiology In tricuspid atresia, the right atrium fails to open into right ventricle through a right atrioventricular va

Pseudopodia – protozoans, Pseudopodia – Protozoans Pseudopodia are flo...

Pseudopodia – Protozoans Pseudopodia are flowing cytoplasmic protrusions of the cell causing amoeboid movement. In protozoans pseudopodia exist in several forms. The most fami

Explain about the acesulfame k - artificial sweeteners, Explain about the A...

Explain about the Acesulfame K - Artificial Sweeteners? Acesulfame-K (potassium salt of 6-methyl-1, 2, 3-oxathazin-4(3H)-one 2, 2 dioxide) is a sweetener which is commonly used

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd