Session 1 - Renal Reabsorption And Secretion - Epithelial Transport

Question 1

How does primary active transport occur in the nephron?

Answer 1

Via ATPases

Apical membrane:
- H+ATPase (pumps H+) out

Basolateral membrane:

• Na/K ATPase (pumps Na+ out, K+ in)
• PMCA (plasma membrane calcium pump) (pumps Ca2+ out)

Question 2

Where does renal reabsorption of Na+ occur?

Answer 2

Early proximal tubule
Thick ascending limb
Distal convoluted tubule
Collecting duct