Intestinal mucosa - Absorption - Water

3 important questions on Intestinal mucosa - Absorption - Water

How can water move through cell membranes?

Aquaporins and tight junctions (e.g. Proximal SA enterocytes) through osmosis and oncotic pressure of proteins

What is oncotic pressure?

It is the power that proteins exert to pull water. It is higher in capillaries than in lateral spaces due to serum proteins.

How do pathogens cause diarrhea?

Damage of intestinal epithelium leads to loss of absorption region for nutrients and electrolytes. Water is lost osmotically.

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