A test to measure electrical activity across muscle membranes by means of electrodes that are attached to a needle inserted into the muscle is:

A) muscle biopsy.
B) lactic dehydrogenase.
C) creatine phosphokinase.
D) electromyography.

Electromyography

A diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons) by recording the electrical activity.

Electrical Activity

Movements of ions that create electrical impulses, fundamental for the functioning of nerves and muscles, including the heart and brain.

Electrodes

Conductive materials that allow electricity to enter or leave an object, substance, or region, commonly used in electrical circuits and medical devices.