Intestinal mucosa - Absorption - Transport across membrane

5 important questions on Intestinal mucosa - Absorption - Transport across membrane

What are some types of active transport?

1. Primary active transporter (utilizes ATP)
2. Secondary active transporter (utilizes passive sodium diffusion)
3. Tertiary active transport (utilizes passive molecule diffusion from secondary active transport)

What are the three mechanisms of sodium absorption from gut lumen?

1. Symporters
2. Antiporters
3. Simple diffusion

What must happen to nutrients for absorption?

Nutrients must be hydrolyzed into simple molecules
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How do symporters work?

The passive diffusion of Na+ into the cell drives another substance in the same direction across the membrane (e.g. Glucose, amino acids)

How do antiporters work?

The simple diffusion of Na+ drive another molecule out of the cell and into the lumen (e.g. H+)

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