GENERAL HISTOLOGY

Detailed explanation-1: -Expert-Verified Answer. After an action potential potassium ions rapidly diffuse out of the cell into the tissue fluid. An action potential occurs when a nerve impulse is sent from a cell body where the sodium channel in the cell membrane opens and the positive sodium ions surge into the cell.

Detailed explanation-2: -Eventually the extra K+ ions diffuse out of the cell through the potassium leakage channels, bringing the cell from its hyperpolarized state, back to its resting membrane potential.

Detailed explanation-3: -After the action potential peak is reached, the neuron begins repolarization (3), where the sodium channels close and potassium channels open, allowing potassium ions to cross the membrane into the extracellular fluid, returning the membrane potential to a negative value.

Detailed explanation-4: -Sodium (Na+) and potassium (K+) are the two ions responsible for the propagation of the action potential down the neural axon.