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Chapter 7. Renal potassium handling
Previous Chapter Next Chapter Self-Assessment for this chapter
Keypoints
- Potassium is the major intracellular cation
- Potassium is pumped into cells by the NaK2Cl transporter and then leaks out through potassium channels
- The potassium gradient across the cell membrane is the main influence on the electrical potential across the membrane and so on the excitability of tissues such as cardiac cells and neurones
- Potassium is both freely filtered and then reabsorbed and to a lesser extent secreted
- Potassium excretion is mainly regulated by altering potassium secretion
- Most potassium reabsorption occurs in the proximal tubule
Self-Assessment Questions for this Chapter