Describe the physiological role, distribution and regulation of potassium (K+).
Potassium is the second most common cation in the body and the main intracellular cation.
It is widely distributed and has many important roles. Maintenance of potassium balance
depends mainly on secretion by the kidneys in the distal and collecting tubules. Candidates
were expected to mention the influence of aldosterone, and other hormones such as
glucocorticoids, catecholamines and vasopressin have as well as factors such as
acidosis/alkalosis. Candidates who had a systematic and structured approach performed