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| 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] |
| caffeine |
a bitter substance found in coffee, tea, chocolate, and some sodas. Caffeine stimulates the heart and nervous system and can cause a person to stay awake and alert. |
| epilepsy |
a nervous system disorder that causes convulsions and unconsciousness. |
| 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] |
| paralysis |
a loss of feeling in or the ability to move a body part. Paralysis is caused by injury or disease of the nervous system. |
| 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] |
| polio |
a short form of "poliomyelitis," a disease caused by a virus that attacks the spinal cord and damages the nervous system. Poliomyelitis affects mainly children and can lead to paralysis or deformed limbs. |
| poliomyelitis |
a disease caused by a virus that attacks the spinal cord and damages the nervous system. Poliomyelitis affects mainly children and can lead to paralysis or deformed limbs. Jonas Salk invented a vaccine that prevents poliomyelitis. |
| reflex |
a response or reaction of the body that is not chosen or controlled by conscious thought. A reflex occurs when the nervous system reacts to a stimulus. [1/3 definitions] |
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