sodium channel

Sodium channels are protein structures embedded in cell membranes that are crucial for the transmission of electrical signals in nerve and muscle cells. These channels facilitate the movement of sodium ions (Na+) across the membrane, which is essential for generating action potentials, the electrical impulses that enable communication in the nervous system.12

When a neuron is stimulated, voltage-sensitive sodium channels open, allowing Na+ to flood into the cell. This influx of positive charge causes a rapid depolarization of the membrane, reaching a threshold potential that triggers the action potential. This process is vital for muscle contraction and nerve impulse propagation. Mutations in sodium channel genes, such as SCN4A, can lead to disorders like myotonia, characterized by difficulty relaxing muscles after contraction.23