The electrical charge difference between the inside and outside of a cell, maintained by the cell's membrane. Healthy cells hold a resting voltage of approximately -70 to -90 millivolts (mV), which is essential for nutrient absorption, cell-to-cell communication, and normal function. When cells are damaged or stressed, this voltage can change. Because PEMF induces a small electric field in tissue, it may influence the movement of ions across the membrane, one of the proposed pathways by which the field interacts with cells.
A living cell holds a small voltage across its membrane, more positive on one side than the other. Channels in the membrane let charged ions cross, which shifts that voltage. This is the electrical side of a cell that a changing magnetic field can interact with. It is background biology, not a claim about any specific outcome.
