Final answer:
Exteroceptors respond to stimuli that are external to the body, different from interoceptors or proprioceptors which respond to internal organs and movements or positions of body parts respectively.
Step-by-step explanation:
Exteroceptors respond to stimuli external to the body. These include sensory receptors positioned to interpret stimuli from our environment, such as photoreceptors in the eye that detect light, or somatosensory receptors in the skin that detect touch, temperature, and pain.
Exteroceptors are contrasted with interoceptors, which respond to stimuli from internal organs, and proprioceptors, which are concerned with the position or movements of parts of the body.