Cameron touches a hot iron and immediately pulls his hand away. His quick response occurs because:
A) his glands have secreted chemical messengers called hormones.
B) the brain has registered that pain is occurring and responds quickly.
C) neurons in the spinal cord touch end to end to increase response speed.
D) spinal reflexes are automatic, requiring no conscious effort.

Question

Quizplus · Accepted Answer

Spinal reflexes are automatic and do not require conscious effort. When Cameron touches the hot iron, sensory neurons in his hand send a signal to his spinal cord, which then automatically sends a signal back to his muscles to quickly pull his hand away from the source of pain. This reflex occurs without involving the brain, explaining the speedy response.

Cameron Touches a Hot Iron and Immediately Pulls His Hand