Proximal convoluted, Biology

Assignment Help:

Proximal Convoluted

Tubule The glomerular filtrate, which is isosmotic to plasma, enters the proximal convoluted tubule where its volume is reduced by about 80%. This reduction in fluid v6lume is 'accomplished by the active reabsorption of NaCl, glucose, amino acids, etc. from the tubular fluid. As these solutes are removed, the tubular fluid becomes hypoosmotic and the interstitial fluid surrounding the tubular wall becomes hyperosmotic. This causes passive diffusion of water out of the tubule to restore isosmotic condition between the tubular fluid and the surrounding cortical interstitium.

This reabsorption of water is secondary to solute transport and occurs inevitably irrespective of the water requirements of the body. Hence, it is called the obligatory reabsorption of water. Thus, in the proximal convoluted tubule, there is a drastic reduction in fluid volume without any change in its osmolarity. At the normal plasma glucose concentration of 100 mg per 100 ml, glucose is totally reabsorbed from the ultrafiltrate in the proximal convoluted tubule. If the plasma glucose concentration increases above the .normal level, its concentration in the ultrafiltrate also increases correspondingly. If it exceeds, the capacity of the transport mechanism to reabsorb, some glucose appears in the urine as happens in diabetic patients.


Related Discussions:- Proximal convoluted

Discuss the concept of alpha-islet cells of the pancreas, Glycogen A. p...

Glycogen A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-islet cells of the pancreas. C. bindi

Define principle of fehling test - reduction tests, Define Principle of feh...

Define Principle of fehling test - reduction tests? Sugars that possess a free or potentially free (those that can be converted to free) aldehyde or ketonic group have a proper

Problem of polarity, Problem of Polarity The control of polarity in r...

Problem of Polarity The control of polarity in regenerating coelentrates like hydra has received much attention for many years. You are already aware that while a hydra is cu

Explain biotin (vitamin h), Biotin (vitamin H) It was revealed  that eg...

Biotin (vitamin H) It was revealed  that egg yolk could prevent dermatitis and emaciation  in  rats that were kept on  raw  egg white a$ the main protein source. The factor of

Qualitative test for specific sugars, what is another test for pentoses? wh...

what is another test for pentoses? what is the positive result for this test?

Gastrulation, Gastrulation  Gastrulation is the process through whic...

Gastrulation  Gastrulation is the process through which the presumptive areas of organ specific rudimetns present on the surface of blastula move to their specific position

Omnispective classification, Omnispective Classification This is the ex...

Omnispective Classification This is the extension of the concept of natural classification put forward by Black Welder (1967). The approach seems quite realistic and pragmatic.

Anaerobic energy, how is the anaerobic energy system not entirely anaerobic...

how is the anaerobic energy system not entirely anaerobic?

Which hormones secreted by adrenal medulla, Q. What are the hormones secret...

Q. What are the hormones secreted by the adrenal medulla? What are their respective functions? The medullary portion of the adrenals secretes hormones of the catecholamine grou

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