In intracellular fluid, which of the following has least concentration?: (A) Calcium, (B) Magnesium, (C) Potassium, (D) Protein
Answer is A. - Calcium is kept very LOW in cytoplasm, hence intracellular fluid doesn't contain much Ca+2 - Calcium is mostly stored in organelles inside cell - E.g. In sarcoplasmic reticulum of muscle cell etc.