Digestive secretions

Question 1

In the Jejunum and duodenum what 2 major ions have a net absorption?

Answer 1

Na+ and Cl-

Question 2

How is Na+ absorbed in the Jejunum and duodenum?

Answer 2

Facilitated by active transport mechanisms like SGLT1 and NHE3. Helps in absorption of nutrients like glucose and amino acids.

Question 3

How is Cl- absorbed in the Jejunum and duodenum?

Answer 3

Follows movement of sodium ions. Passively diffuses through channels in epithelial cells. Often coupled with sodium absorption to maintain electroneutrality.

Question 4

how is water absorbed in the Jejunum and Duodenum?

Answer 4

Occurs through osmosis following ion movement. Creates osmotic gradient for water absorption into epithelial cells.