The pupillary light reflex regulates the intensity of light entering the eye. When bright light is detected by photoreceptors in the retina, electrical impulses are transmitted to the brain. In response, the brain sends impulses to the circular muscles of the iris, causing the pupil to constrict.
Which of the following correctly classifies the types of neurones carrying these impulses to and from the brain?
To the brain: sensory neurones; From the brain: motor neurones
To the brain: motor neurones; From the brain: sensory neurones
To the brain: sensory neurones; From the brain: relay neurones
To the brain: relay neurones; From the brain: motor neurones
