Mon22November1200AM 11

Of these, which of the following is the single most abundant intracellular ion?

(Please select 1 option)

Magnesium

Sodium

Chloride

Calcium Incorrect answer selected

Phosphate This is the correct answer

Explanation

Phosphate is a predominantly intracellular anion with a concentration of approximately 100 mmol/L, although determination of the precise intracellular concentration has been difficult.

Most intracellular phosphate is either complexed or bound to proteins and lipids. In response to kinases and phosphates, these phosphate ions attach and detach from different molecules, forming a constantly shifting pool.

Intracellular phosphate is essential for most, if not all, cellular processes; however, because the intracellular concentration of phosphate is greater than the extracellular concentration, phosphate entry into cells requires a facilitated transport process.

Other intracellular ions:

Potassium 150 mmol/l

Calcium 100 nmol/l

Sodium 15 mmol/l

Chloride 10 mmol/l

Magnesium 20 mmol/l

Answer Statistics

1

11%

2

11%

3

8%

4

24%

5

49%

Times answered: 255