Mechanism for Nutrient Transport

Geronimo user at
Fri Mar 7 11:11:01 EST 2003

"Dan Marquez" <dmarquez3 at> wrote in message
news:AdU9a.46518$aa.13710447 at
> What is the mechanism that a nutrient gets transported from within a small
> intestine to the lymph or bloodstream?  Are there pores of limited size?

You should be able to find this info in a Textbook of Physiology. There are
multiple mechanisms, for example active transport and transepithelial
transport. Lipids are packed into lipoprotein complexes.

> Once the nutrient is in the lymph or bloodstream, how does a "hungry" cell
> "grab" a desired nutrient?

Depends on the nutrient. For example, for lipids fractions there are
specialized membrane receptors.

> What makes the immune system think a nutrient is
> not an antigen?

Oral tolerance (involves Payer's Patches) doesn't always work so food
allergies may develop.

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