Which is an involuntary automatic response to a stimuli? a reflex an interneuron a receptor a hormone

Sensory receptor. neuron that reacts to a specific stimulus, such as light or sound, by sending impulses to other neurons and eventually to the central nervous system ... Reflex arc. The pathway followed by your nerves during an involuntary, fast and automatic response to immediate danger; Only one interneuron is involved.

The answer is a sensory receptor