Define the absorption of vitamin a, Biology

Assignment Help:

Define the Absorption of Vitamin A?

Vitamin A and carotenoid tend to aggregate with lipids into globules, which then pass into the small intestine. Dietary vitamin A (retinol) is absorbed as such in the intestines.  Retinyl esters (mainly palmitate) arc hydrolyzed by the combined action bile  salts and the esterases in the small intestine. The released carotenoids and retino1 in the small intestine are solubilised into micelles i.e., small aggregates of mixed lipids and bile salts suspended within the gastric bolus (material taken into the body by way of.  The digestive tract)solution. The micelles are absorbed into the intestinal mucosal cell.  Approximately 70 to 90% of retinol from the diet is absorbed as long as the diet is adequate in fat. Carotenoid absorption from the diet ranges from about 20% to 50%, but carotenoid absorption may be as low as 5%.


Related Discussions:- Define the absorption of vitamin a

Lymphatic system, L YMPH A TI C SYSTEM As 'Middle man' of circul...

L YMPH A TI C SYSTEM As 'Middle man' of circulation it mediates exchange between blood and the tissue. It is also a collecting system like venous system. Basically 'o

Calcium - mineral elements, CALCIUM It is the most abundant mineral of...

CALCIUM It is the most abundant mineral of animal body. Calcium is available in all types of vegetables, grain, milk, cheese, eggs, fish and butter. By its deficiency r

Explain the structure of intermediate filaments, Explain the structure of I...

Explain the structure of Intermediate Filaments? Intermediate filaments , about 8 to 10 nm in diameter, are so named because they are intermediate in size between microfilamen

Skeletal tissue, what is the classification of skeletal tissue?

what is the classification of skeletal tissue?

Define issues that are covered by nutrition economics, Define issues that a...

Define issues that are covered by nutrition economics? The issues that are covered by nutrition economics include: 1. Quantities of food commodities and their development in

What are the fruiting bodies present in some fungi, What are the fruiting b...

What are the fruiting bodies present in some fungi? Fruiting bodies are structures made of hyphae that project radially from the superior portion of the peduncle of some fungi.

Guards for machines and equipment, Guards for Machines and Equipment ...

Guards for Machines and Equipment Various machines and equipment used for manufacturing require guards for protecting the operator from any injury. These machines include: Wo

What is the approximate ph of the salivary secretion, What is the approxima...

What is the approximate pH of the salivary secretion? Is it an acid or basic fluid? What are the main functions of saliva? The saliva pH is approximately 6.8. It is therefore a

Types oligosaccharide linkages, In glycoproteins, two main parts of oligosa...

In glycoproteins, two main parts of oligosaccharide linkages exist: a) An O-linked oligosaccharides attached to the protein by O-glycosidic bonds, to the OH groups of serine or

Fats, definition and explanation of fats

definition and explanation of fats

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