Answer to Question #51116 in Biology for mia

Question #51116
how are minerals absorbed in the digestive system??
Expert's answer
The main minerals which we cover here are calcium, iron, copper, zinc, phosphorus.
Calcium is absorbed by two different ways: active and passive transport. Active transport takes place mostly in the duodenum and it is facilitated by voltage-insensitive (TRP) channels. It depends on the vitamin D levels. Passive transport occurs predominantly in the jejunum and ileum, where calcium diffuses through tight junctions between adjacent intestinal epithelial cells.
Phosphorus is transported into intestinal epithelial cells by co-transport with sodium expression of which is also vitamin D –dependent.
Iron absorption is facilitated by DMT-1. Prior to absorption it is required for iron to reduce from Fe3+ to Fe2+. When iron is getting into the intestinal epithelial cells it then converts back to Fe3+ state.
Copper is absorbed predominantly in the stomach and upper small intestine. Copper is transported through several copper transporters (e.g. Ctr1)
Zinc is absorbed in the small intestine through two main families of zinc transporters: ZnT1 and ZIP.

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be the first!

Leave a comment

New on Blog