| amnesia |
partial or complete loss of memory as a result of an injury to the brain, illness, or shock. |
| brain |
the organ inside the skull of humans and animals. The brain is the main part of the central nervous system. It controls the body's movements and activities and is the center of thought, memory, and feelings. [1/3 definitions] |
| concussion |
an injury to the brain caused by a heavy blow, fall, or shock. [1/2 definitions] |
| conscious |
When you are conscious, your brain is awake and working normally. You can feel, think, hear, and see. [1/2 definitions] |
| depressed |
feeling continuously sad over a long period of time due to a condition within the brain. [1/3 definitions] |
| exercise |
Exercise is using your muscles so that they will stay strong or get stronger. Exercise is also using your brain so that it continues to work well. [1/4 definitions] |
| feel |
If you feel the wind blowing, you know it is blowing because your body is reacting to the movement of the air and sending signals about it to your brain. [1/8 definitions] |
| feeling |
If you have a pain in your foot, your foot sends a message to your brain that says, "I'm hurting!" That message is called a feeling. If someone's fingers get very, very cold, they sometimes stop sending any message to the brain at all. When that happens, we say that there is no feeling in those fingers or that the fingers have lost feeling. [1/5 definitions] |
| head |
the top or leading part of an animal body. In vertebrates the head contains the brain, eyes, nose, ears, and mouth. In invertebrates, the head contains eyes, mouth parts, and other organs. [1/10 definitions] |
| hear |
If you hear, your brain has the ability to process sounds that come into your ears. [1/5 definitions] |
| learn |
When you learn, you begin to know or understand things you didn't know or understand before. When you learn about something, you get information about it that goes into your brain. [1/4 definitions] |
| message |
A message is a bit of information sent to the brain or to a mechanical thing that can receive it and use that information. [1/3 definitions] |
| nerve |
any of the fibers that carry messages to and from the brain and other parts of the body. Nerves are bundled together into a complicated system that connects all parts of the body to the spinal cord and brain. [1/3 definitions] |
| nervous |
The word "nervous" refers to the nerves of the body. Nerves are long, very thin fibers that carry messages between your brain and other parts of your body. A person's nervous system is the system of the body that is made up mainly of the nerves and the brain. Your nervous system gives your body its sense of touch. It also sends signals from your brain to your muscles to make them move. [1/3 definitions] |
| nervous system |
The nervous system is the system in your body that is made up mostly of your nerves and your brain. Nerves are long, very thin fibers that carry messages between your brain and other parts of your body. Your nervous system gives your body its sense of touch. It also sends signals from your brain to your muscles to make them move. |
| pain |
physical hurt or discomfort that is usually caused by injury or illness. Pain is the nervous system's way of telling the brain that something is wrong. [1/5 definitions] |
| paralyzed |
If a part of your body is paralyzed, it can't move because your brain can't tell it to move. This can happen if you have an injury to your nervous system. It is the nervous system that sends signals from your brain telling your body to move. It can also happen as an effect of certain drugs. [1/2 definitions] |
| perceive |
When you perceive something, your brain notices it or understands it. If you perceive the difference between two ideas, you can notice the difference between them. You can tell that they are not the same. [1/2 definitions] |
| rack1 |
When you rack your brain, you make your brain work very hard to remember something or figure something out. [1/3 definitions] |
| retina |
the part of the eye at the back of the inside of the eyeball. The retina has cells that sense light and color. Images are formed on the retina and sent to the brain. |
| see1 |
When you see, your eyes take in images that go to your brain. You have the power of sight. As people get older, it usually becomes more difficult for them to see. [1/8 definitions] |