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The cerebral cortex (se-re-brell core-tex) has two parts, the left and right cerebral hemispheres (se-re-brell hem-iss-fears). Your cerebral cortex is where you think, remember, solve problems, imagine, speak, listen, dream, read, and learn.
The brain is one of the heavier organs in your body. It has three main parts.
Your cerebellum (se-re-bell-um) is in charge of your movements. Thanks to your cerebellum, you can walk upright, touch your finger to your nose, jump rope, and wink!
The brain has two halves or hemispheres . The right side of the brain controls the left side of your body, and the left side of your brain controls the body’s right side. Some people think that many of us have one hemisphere that is stronger than the other. Another way to say this is that many people have one side of the brain that is dominant . Answer these questions: Which hand do you use to brush your teeth? Which hand do you use to throw a ball? Which foot do you use to kick a soccer ball? If you use your right hand and foot, the left side of your brain may be dominant. Some people don’t have a dominant hemisphere. They use both sides equally.
Your brain stem controls your breathing and heartbeat so that you don’t have to think about them. Imagine what it would be like if you had to remember to tell your heart to beat! Thankfully, your brain stem takes care of that for you.
Doctors who study the brain are called: Circle every other letter to find the answer!
The brain of a newborn human weighs to ounces. (340–400 grams). In one year, the brain weighs to ounces (1,020–1,200 grams). By age five, the brain is nearly its adult size of pounds (1,350 grams).
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Race a friend to see who can nd the most brains on this page in 60 seconds.
Write the answer here:
Standards Link: Life Science: Students know that living organisms have distinct structures that serve specific functions in growth and survival.
© Vicki Whiting September 2025
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