36. In the cell, what ion concentration gradients should be maintained? (1) calcium (2) chloride (3) sodium (4) potassium (A) (1), (2), (3), (4) are low in intracellular space and high in extracellular space. (B) (1), (2), (3), (4) are high in intracellular space and low in extracellular space. (C) (1), (2) are low in intracellular space and high in extracellular space. But 3, 4 are opposite. (D) (1), (2), (3) are low in intracellular space and high in extracellular space. But 4 is opposite. (E) (1), (2), (4) are low in intracellular space and high in extracellular space. But 3 is opposite.