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Ratios of Various Transport Parameters in TI and TII Cells
| TI : TII Cell Ratio | References | |
|---|---|---|
| Cell surface area | 43 | 4 |
| Osmotic water permeability | 7 | 26 |
| Na+ and K+ uptake/µg protein | ≈3 | 30 |
| Apical Na+ channels/cell | ≈40 | 28 |
| CNG and K+ channels | * | 28 |
| CFTR | 6 | 28 |
CFTR, cystic fibrosis transmembrane conductance regulator; CNG, cyclic nucleotide gated.
Present in TI cells, not TII cells.
