Explain the absorption, storage and elimination of thiamin, Biology

Assignment Help:

Explain the Absorption, Storage and Elimination of thiamin?

After a meal, thiamin is found in the intestine in the free form. Its absorption involves two mechanisms- both active and passive. At lower Intraluminal concentrations (of <1-2mmol/L) thiamin is absorbed by an active sodium-dependent carrier-mediated system. This mechanism involves phosphorylation. At a higher concentration, passive diffusion occurs thiamin is absorbed primarily from the upper jejunum by diffusion and by an active transport mechanism but can also occur in the duodenum and ileum.

After absorption, only a small part passes into circulation as free thiamin while a  greater part is converted into thiamin pyrophosphate (TBP) in the liver and intestinal  rnucosa with the help of the enzyme thiamin  kinase and AT?. A small quantity of thiamin is also converled into thiamin triphosphate (TTP). Thiamin is transported in blood by facilitated diffusion - in erythrocytes in both free and phosphorylated forms and in plasma as free thiamin and TMP. Thiamin or its phosphorylated derivatives are present in negligible amounts in various tissues. Thiamin is excreted in urine.


Related Discussions:- Explain the absorption, storage and elimination of thiamin

What are living and nonliving reservoirs, What are living and nonliving res...

What are living and nonliving reservoirs? Viruses are both living as well as non-living. They have reservoirs of genes. A one nucleotide is a unit of gene. Viral genes make use

Engler and prantls system of classification, Q. Engler and Prantl's System ...

Q. Engler and Prantl's System of Classification? Adolf Engler, Professor of Botany, University of Berlin, Germany, proposed a phylogenetic system of classification in a book en

How much dopamine do need add from a stock, A cat has just arrived to the v...

A cat has just arrived to the veterinary clinic with low blood pressure. The cat weighs 5 kg, and as the on call Vet you want to use a bag of saline to prepare a dopamine drip for

Complications of diabetes, Q. Complications of Diabetes? Diabetes, as y...

Q. Complications of Diabetes? Diabetes, as you know, is a lifelong disease. We have said earlier also that it can be controlled but not cured. Control of diabetes by ensuring n

What do you mean by pollen, Q. What do you mean by pollen? Pollen grain...

Q. What do you mean by pollen? Pollen grains are the male gametophytes of the phanerogamic (flowering) plants So within the pollen grains the male gametes of these plants are f

Specialized structures that help the adhesion between cells, Q. What are th...

Q. What are the specialized structures that help the adhesion between cells? The structures responsible for the union of the epithelial cells are called cell junctions. The mai

Vitamin - d, VITAMIN - D Also known as Calciferol / Anti ricket vit...

VITAMIN - D Also known as Calciferol / Anti ricket vitamin / sun shine vitamin. It is necessary for bones & teeth. It is synthesized in presence of UV rays of sunl

Cut-off points to judge on failures - root canal treatment, Determine cut-o...

Determine cut-off points to judge on failures - Root Canal Treatment a)  Persistent of signs and/or symptom. b)  If in one year there is no decrease in lesion size. c)  I

Anaplasia - characteristics define cancer, Anaplasia - Characteristics Defi...

Anaplasia - Characteristics Define Cancer Anaplasia is a structural abnormality where cells resemble primitive or embryonic tissue in which adult functions are diminished or t

Vaccines for gas infections, In developing countries because of poor compli...

In developing countries because of poor compliance, poverty, ignorance, primary and secondary prevention strategies are difficult to implement properly. Also in western countries (

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