Describe the physiological role, distribution and regulation of potassium (K+).

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College Answer

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 
better.