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

Explain pollen grains, Transfer of pollen grains from the anther to the sti...

Transfer of pollen grains from the anther to the stigma of another flower of the similar plant is known as? Geitonogamy

Thyroid, A person has swelling on the front of his neck. Name the disease h...

A person has swelling on the front of his neck. Name the disease he is suffering from and the cause of it.

Pre-operative teaching in cardiac surgical operation, Pre-operative Teachin...

Pre-operative Teaching Brief explanation-anatomy, physiology of the cardio-respiratory system.  The disease and the operation which is going to be done.  Operati

Describe the terms diffusion osmosis and filtration, Describe the terms dif...

Describe the terms diffusion, osmosis and filtration. Explain why each process is important for the human body.

Animals of estuaries, Animals of Estuaries The animals of estuaries an...

Animals of Estuaries The animals of estuaries and related wetlands such as marshes and swamps are tremendously important not only as denizens of their environment but also for

What is the typical feature of the epithelia, What is the typical feature o...

What is the typical feature of the epithelia? How different is it from the connective tissue? The typical feature of the epithelium is the absence or almost absence of space a

Which chemical substances produced by water photolysis, Q. What are the che...

Q. What are the chemical substances produced by water photolysis and what is the destination of each of those substances? Free electrons, molecular oxygen and hydrogen ions are

Explain treatment of latent tb infection, Treatment of latent tb infection ...

Treatment of latent tb infection The risk of developing clinical tuberculosis is greatest in patients with latent TB who are also infected with HIV or are receiving immunosuppr

Define the sequence-specific dna binding, Which of the following statements...

Which of the following statements regarding the interactions among sequence-specific DNA binding domains and their recognition sites is incorrect? A. Sequence-specific DNA bind

Explain environmental resistance and the population growth, What is the rel...

What is the relationship among environmental resistance and the population growth according to the biotic potential curve and the real population growth curve? The difference

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