Villi absorption

[dental13]

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Villi contains lacteals and capillaries where absorptions take place.

My question is when villus campillaries absorb glucose and amino acids, does it go with active transport or diffusion? Villus lacteals basically absorb any fats to the lymphatic system and this is done by difusion?

I am confused, wikipedia does not have this info.

 

[MrSummerlin]

Dont quote me but I feel 80% sure that it is by diffusion.

 

[Mr. Thirsty]

Villi contains lacteals and capillaries where absorptions take place.

My question is when villus campillaries absorb glucose and amino acids, does it go with active transport or diffusion? Villus lacteals basically absorb any fats to the lymphatic system and this is done by difusion?

I am confused, wikipedia does not have this info.

Lipids are done by Diffusion. Lipids are made up of the same characteristics as the cell membrane (phospholipids) at both the enterocyte villi and lacteal. Therefore they can pass by diffusion as long as they are in their Fatty acid form and not triacylglycerol.

Glucose is absorbed into the enterocyte villi by active transport (Sodium/glucose cotransporter (SGLT1) which is active transport because then ATP is used to pump out the sodium afterwards), but then glucose is absorbed into the blood stream by passive transport (GLUT 2 transporter which is bidirectional and passive).

Amino acids are active transport into the villi (Sodium dependent and therefore must pump it out after it builds up) and diffusion into the capillary.

Hope that helps...

 

[dental13]

Lipids are done by Diffusion. Lipids are made up of the same characteristics as the cell membrane (phospholipids) at both the enterocyte villi and lacteal. Therefore they can pass by diffusion as long as they are in their Fatty acid form and not triacylglycerol.

Glucose is absorbed into the enterocyte villi by active transport (Sodium/glucose cotransporter (SGLT1) which is active transport because then ATP is used to pump out the sodium afterwards), but then glucose is absorbed into the blood stream by passive transport (GLUT 2 transporter which is bidirectional and passive).

Amino acids are active transport into the villi (Sodium dependent and therefore must pump it out after it builds up) and diffusion into the capillary.

Hope that helps...

wow, thanks 👍