the equilibrium potential for anion X is 90mv Based on this

the equilibrium potential for anion X is -90mv. Based on this, which of the following is true? a) there is a high concentration of X in the extracellular fluid b) there is a high concentration of X in the intercellular fluid c) there is no concentration gradient for X d) we cannot determine concentrations without knowing which way the pumps are moving anion X e) concentration is irrelevant to equilibrium potentials

Solution

Ans: When a nerve or muscle cell is at \"rest\", its membrane potential is called the resting membrane potential. In a typical neuron, this is about –70 millivolts (mV). The minus sign indicates that the inside of the cell is negative with respect to the surrounding extracellular fluid. If the equilibrium potential for anion X is -90mv then,

b) there is a high concentration of X in the intercellular fluid