How reflexes work faster than messages to the brain.

    • A heavy book
    • At least one person to surprise

    1. Surprise a friend of family member by tossing a large book onto the floor.
    2. What happens when it goes SLAM? Did your friend or family member: twitch, move his or her head, blink, put up his or her hands, or scream?
    3. If he or she did any of those, you just demonstrated a reflex.

    The body reacts automatically, just like when you instantly move your hand if you touch a hot stove. You move even before the "Hey, my hand is on a hot, burning stove!" message gets to your brain. Thank you, reflexes!


    Your Brain and Nervous System

Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2021 KidsHealth® All rights reserved. Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com