Pollen tubes, as most biological systems, are influenced by electrical stimulus.

They differ from pacemakers, which help the heart beat by sending an electrical stimulus.

The actuator provides mechanical motion in response to an electrical stimulus.

In both techniques, natural or electrical stimuli can be used.

"Oh, he had that too, in the form of electrical stimuli."

When it did, the apparatus delivered an electrical stimulus to that portion of the brain.

Electroreception is the biological ability to perceive natural electrical stimuli.

The central fact is that an electrical stimulus may manifest its effect at a distant part of the nervous system.

He used electrical stimuli for study of the human sensory cortex.

Heart rate is dependent on the movement of an electrical stimulus through the individual heart cells.