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

Advantages of pyramid of energy, Advantages of Pyramid of Energy A pyr...

Advantages of Pyramid of Energy A pyramid of energy must be based on determination of the actual amounts of energy that individuals take in, how much they burn up during metab

Behaviour change communication - iron deficiency anaemia, Define Behaviour ...

Define Behaviour change communication - iron deficiency anaemia? In communities that are illiterate and consequently ignorant of the consequences of nutrition disorders and the

Explain ground meristem in primary root growth, Explain Ground Meristem in ...

Explain Ground Meristem in Primary Root Growth? To review, the protoderm is the primary tissue that eventually forms the outside layer that covers the root and shoot and leaves

List the four phases of mitosis, List the four phases of mitosis, and brief...

List the four phases of mitosis, and briefly explain what occurs during each phase. Prophase: the chromatin coils and produces chromosomes, the nucleolus and nuclear envelope d

Defination of behaviour change communication, Q. Defination of Behaviour Ch...

Q. Defination of Behaviour Change Communication? Behaviour Change Communication (BCC) is an interactive process with communities to develop specific messages and methods using

Explain about the isoflavones, Explain about the Isoflavones? These are...

Explain about the Isoflavones? These are usually treated separately from the other five subclasses and are an area of considerable research interest. Isoflavones are found almo

Local needs, Local Needs, Choices and Circumstances Beyond obvious cho...

Local Needs, Choices and Circumstances Beyond obvious choice for private sector, the best public-private balance for a country depends on its local culture and circumstances.

Vaso-constriction, what is a vaso-constriction? what are the effects of vas...

what is a vaso-constriction? what are the effects of vaso-constriction in the skin?

Metabolic significance of hmp pathway, Metabolic Significance of HMP Pathwa...

Metabolic Significance of HMP Pathway Having gone  through  the HMP pathway, you would have got  some idea about the significance  of this alternative oxidative  pathway for  t

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