Define absorption, storage and elimination of ascorbic acid, Biology

Assignment Help:

Define Absorption, Storage and Elimination of ascorbic acid?

Ascorbic acid is rapidly absorbed from the intestines primarily by active transport.  Simple diffusion or carrier-mediated transport may also contribute to a small extent of uptake of the vitamin from the mouth and stomach. Prior to absorption,  ascorbate  may be oxidized to form dehydroascorbate which is absorbed by passive diffusion or by use of glucose transporters. It passes through the portal vein to the general circulation and to all tissues. Each organ or tissue has an optimal saturation level of ascorbic acid. It is not stored to any appreciable extent in the body. The degree of absorption decreases with increased vitamin intake and varies from 16% to 98%, the average overall absorption being about 80% to 95%. Unabsorbed vitamin C may be metabolized by the intestinal flora. Pectin and zinc are a few substances that impair its absorption. Excess is excreted in urine.


Related Discussions:- Define absorption, storage and elimination of ascorbic acid

How is digestion performed in protozoans, How is digestion performed in pro...

How is digestion performed in protozoans? Digestion in protozoans is intracellular digestion: organic material is internalized and degraded inside the cell. Protozoans get

Explain ozone shield, Explain ozone shield? Name two gases that can ca...

Explain ozone shield? Name two gases that can cause damage to this shield. Give one harmful effect of this damage each on plants and animals.

How does the pancreatic juice help the digestion of lipids, Q. How does the...

Q. How does the pancreatic juice help the digestion of lipids? What is the involved enzyme? The enzyme pancreatic lipase is present in the pancreatic juice this enzyme breaks t

Social determinants of health - unemployment, Social Determinants of Health...

Social Determinants of Health - Unemployment That unemployment gives rise to social insecurity and psychological stress is well recognised. Fears and uncertainties are known t

Cell theory to be developed after microscopes, Why did it take 150 years fo...

Why did it take 150 years for the cell theory to be developed after microscopes were invented? Information about cells could not be understood and organized into a central theo

Growth curve, typical growth curve in plants

typical growth curve in plants

Crossing over, is crossing over of chromosomes is a method?

is crossing over of chromosomes is a method?

What is plant tissues explain there types, What is Plant Tissues explain th...

What is Plant Tissues explain there types? Vascular plants have separate organs to carry out specialized functions. For instance, leaves function to convert radiant energy to

Explain the concept of overheating the bone, Overheating the bone and exert...

Overheating the bone and exerting too much pressure Minimal temperature elevation during surgical drilling of the bone is a key factor in atraumatic surgical technique. Bone ce

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