At this moment, your brain is very busy. It's taking in a jumble of sights and sounds, but focusing on just a few. It's seeing the letters on your screen, reading them as words, and thinking about what they mean. It's helping you breathe and keeping your heart beating. Your brain is made of many parts. Some help you see and hear. Others help you learn and remember. And others keep your body functioning. All these parts work together.

Definition: the complex organ contained in your skull. It is the central part of the nervous system. It controls thoughts, emotions, movement, and bodily functions.
Importance: The human brain gives us the power to think, plan, imagine, and speak.
Weight: 3 pounds (adult); 2 pounds (1-year-old)
Cool Fact: If your brain were taking out of your head and placed in a bowl, it would resemble thick pudding.