Categorize the following under the headings stimulus and response.
1 . Stimulus: The message of green light changing red is sensed by the sensory nerves.
Response: This message is sent to the brain by these nerve cells. The brain understands the message (that we should apply the brake) and delivers it to the muscles that express the response via the motor neurons
2 . Stimulus: The stimulus is something falling,
Response: This message is sent to the brain by these nerve cells. So the brain understands the message and the response given is pain.
3. Stimulus: These sensory nerve cells transmit information to the brain and spinal cord, causing motor neurons to fire.
Response: The hand muscles receive the signal from the motor neurons to remove the hand from the hot plate.