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

What are the sources of dietary fibre in our diet, Q. What are the sources ...

Q. What are the sources of dietary fibre in our diet? The sources of dietary fibre include whole grain cereals, legumes, whole pulses, leafy vegetables, vegetables like peas,

Explain the work of john ray in animal taxonomy, Explain the Work of John R...

Explain the Work of John Ray in Animal Taxonomy? The first important work on both animal and plants was initiated by John Ray (1627-1705). He followed Aristotle and divided ani

Explain food applications of gum karaya, Explain Food Applications of gum k...

Explain Food Applications of gum karaya The water absorbing and water-holding capacity of Karaya, together with an excellent acid compatibility made it suitable for its use

Logical order in which molecules-atoms are associated, Q What is the logica...

Q What is the logical order in which the concepts of molecules, atoms, cells... up to biosphere are associated? Atoms form molecules that form cells that form tissues that form

Blood cells, BLOO D CORPUSCLES (= BLOOD CELLS) - Blood corpuscles are ...

BLOO D CORPUSCLES (= BLOOD CELLS) - Blood corpuscles are of the following three types: Erythrocytes, Leucocytes and Thrombocytes. (A )     Erythrocytes (Red Blood Corpusc

Why plant nutrients is said to be essential, Why plant nutrients said to be...

Why plant nutrients said to be essential An element is said to be essential if,   (i)   The deficiency of an element in plant, makes it impossible to complete the vegetative

Define recommended dietary allowance for folate (rda), Define Recommended D...

Define Recommended Dietary Allowance for Folate (RDA)? Folate requirements are the intake levels necessary to prevent deficiency with clinical symptoms. The requirements are ex

Illustrate the horizons in detail, Illustrate the Horizons in detail 'O...

Illustrate the Horizons in detail 'O'  is the  organic horizon  formed from t he organic litter derived from plants and animals and fresh or partially decomposed organic materi

Walrasian model, Normal 0 false false false EN-IN X-N...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

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