How the Body Responds

Your body is always responding to the world around you. A response is how your body reacts to information from your senses. This happens because your brain is constantly receiving messages from your eyes, ears, skin, nose, and tongue. After the brain processes this information, it sends instructions back to different parts of your body to respond.

Some responses happen very quickly. These fast responses are called reflexes. A reflex is an automatic reaction that happens without you thinking about it. When you touch something hot, you pull your hand away instantly. When you hear a loud noise, you might jump or cover your ears. Your brain processes the danger signal and tells your body to move before you even realize what happened. Reflexes protect you from harm.

Other responses take more time because they involve thinking and making choices. These are called voluntary responses. When you decide what to eat for lunch, your brain thinks about different options. When you choose which path to take home from school, you consider different routes. Your brain processes information and helps you make a decision.

Throughout your day, your body makes hundreds of responses. Some are so fast you don't notice them. Others require careful thought. All of these responses help you interact safely and successfully with the world.

Interesting Fact: Your fastest reflexes can send signals through your body at speeds up to 250 miles per hour—that's faster than a race car!