Lipid Absorption

The rate of gastric emptying is regulated to deliver packets of fat into the duodenum that may be easily digested and assimilated without overloading. The avoidance of duodenal overload is dependent on the efficacy of the neural and hormonal feedback mechanisms regulating gastric emptying and intestinal transit, the ileal brake.

The absorption of fat is a different process from that of carbohydrate and protein by virtue of the insolubility of the molecules of lipid in water (Figure 6). The products of lipase digestion, fatty acids and monoacylglycerols, are insoluble and so cannot diffuse through the chyme to reach the enter-ocyte membrane. The role of micelles produced by the action of bile salts is carriage of the lipid molecules to the enterocyte luminal membrane, where the fatty acids and monoacylglycerols diffuse from the micelle through the lipid component of the membrane to enter the enterocyte cytoplasm.

On this basis, the process of transport has always been assumed to be passive diffusion. Recently, it has been demonstrated that some carrier-dependent mechanisms are implicated. The observation that

Amino

Na+ acid Secondary active transport

Primary active transport

Primary active transport

Amino acid

Amino acid

Diabetes Sustenance

Diabetes Sustenance

Get All The Support And Guidance You Need To Be A Success At Dealing With Diabetes The Healthy Way. This Book Is One Of The Most Valuable Resources In The World When It Comes To Learning How Nutritional Supplements Can Control Sugar Levels.

Get My Free Ebook


Post a comment