Answer: The correct answer for the blank is -
Sensory neuron.
Step-by-step explanation:
Sense organs can be described as organs or parts of the body that are sensitive to or responds to any change in the environment (external stimuli such as light, heat, chemical, vibration etc ) and convey messages in the form of nerve impulses to the central nervous system through sensory neurons.
Thus, they are made up of sensory neurons and other cells that help in gathering information, which is then passed to the CNS.