Correct option is D
Sodium (Na⁺) and Potassium (K⁺) are critical for the transmission of nerve impulses in the human body. These two electrolytes play a crucial role in maintaining the membrane potential of neurons through the sodium-potassium pump. This pump actively transports sodium ions out of the cell and potassium ions into the cell, creating an electrochemical gradient.
When a nerve impulse, or action potential, is triggered, sodium channels open, allowing sodium to flow into the neuron, causing depolarization. This is followed by potassium exiting the cell, which repolarizes the neuron. This process enables the transmission of electrical signals along nerve cells, which is fundamental for nervous system function, muscle contraction, and even heartbeats.
