This is the second edition of the Renal Tubular Transport #2. S1 Segment, Proximal Tubule. Sodium Transport 2 (Sodium/Phosphate Transport) Click here for the 1st Edition. I have improved the number of phosphate transporters dependent on sodium.

The same electrochemical gradient generated by the Na/K ATPase mentioned in the previous post serves as the force behind the sodium/phosphate cotransporter

Here, we show the following in the apical membrane of the S1 segment of the proximal tubule.

• The NaPi-IIa cotransporter, which brings 3 sodium ions with 1 HPO4^2-
• The NaPi-IIc cotransporter, which brings 2 sodium ions with 1 HPO4^2- (not in S3 segment)
• The PiT-2 cotransporter, which brings 2 sodium ions with 1 H2PO4^-

This will also be shown when we show the phosphate transport in a subsequent post

Previous Posts in this Series

Renal Tubular Transport #1. S1 Segment, Proximal Tubule. Sodium Transport 1

Renal Tubular Transport #2. S1 Segment, Proximal Tubule. Sodium Transport 2

Renal Tubular Transport #3. S1 Segment, Proximal Tubule. Sodium Transport 3

Renal Tubular Transport #4. S1 Segment, Proximal Tubule. Sodium Transport 4

Renal Tubular Transport #5. S1 Segment, Proximal Tubule. Sodium Transport 5

Renal Tubular Transport #6. S1 Segment, Proximal Tubule. Sodium Transport 6

Renal Tubular Transport #7. S1 Segment, Proximal Tubule. Sodium Transport 7

Renal Tubular Transport #8. S1 Segment, Proximal Tubule. Sodium Transport 8