Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The concentration of Na⁺ is highest in the cytosol, and the concentration of K⁺ is highest in the extracellular fluid.

Ion concentration gradients refer to the differences in the concentration of ions across a membrane, which are crucial for cellular function. In most cells, sodium (Na⁺) is more concentrated outside the cell, while potassium (K⁺) is more concentrated inside. This gradient is essential for processes like action potentials in neurons and muscle contraction.

The sodium-potassium pump is a vital membrane protein that actively transports Na⁺ out of the cell and K⁺ into the cell, maintaining the necessary concentration gradients. This pump uses ATP to function, moving three Na⁺ ions out for every two K⁺ ions it brings in, which is critical for maintaining cellular homeostasis and electrical excitability.

Cell membrane potential is the voltage difference across a cell's membrane, resulting from the uneven distribution of ions. This potential is crucial for the generation of action potentials in excitable cells, such as neurons and muscle cells. The resting membrane potential is typically negative, influenced by the higher concentration of K⁺ inside the cell compared to Na⁺ outside.