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

Developmental concepts unique to infants and young children, Developmental ...

Developmental Concepts Unique to Infants and Young Children The cognitive and social emotional development of infants and very young children has unique features. This age rang

Define nucleosomes , The initial stage of packaging have the binding of t...

The initial stage of packaging have the binding of the chromosomal DNA to histones.  Whole, in chromosomes the ratio of the DNA to histones on a weight basis is around 1:1. There a

Lens regeneration in amphibians, Lens Regeneration in Amphibians It i...

Lens Regeneration in Amphibians It is an amazing fact that between all vertebrates only certain amphibians have the unique ability to regenerate lens, iris and retina in adul

Explain about the deficiency of riboflavin, Explain about the Deficiency of...

Explain about the Deficiency of Riboflavin? Riboflavin deficiency results in the condition of hypo- or ariboflavinosis, with sore  throat, hyperaemia (condition in which the bl

Biological valves, Biological Valves :  Biological valves are available fo...

Biological Valves :  Biological valves are available for all positions. For mitral position they are usually mounted on a stent (stent mounted) whereas for aortic position they ma

Nutritional management in inflammatory bowel disease, Q. Nutritional Manage...

Q. Nutritional Management in Inflammatory Bowel Disease? Adequacy of nutritional needs and minimizing stress on the inflamed or narrowed segment of the bowel are the main princ

Aids, how get a aids

how get a aids

What do you mean by respiratory pigments, Q. What are respiratory pigments?...

Q. What are respiratory pigments? What are some respiratory pigments and in which animal groups can each of them be found? Respiratory pigments are molecules present in the blo

How is arthropod reproduction characterized, Q. How is arthropod reproducti...

Q. How is arthropod reproduction characterized? Reproduction in beings of the phylum Arthropoda is sexual with larval stage in some insects and crustaceans (arachnids) present

Sex, how to do sex ?

how to do sex ?

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