| A | B |
|---|
| addiction | a condition in which a person has extreme difficulty in stopping the use of a drug. |
| alcohol | a drug that is found in some beverages, such as beer and wine |
| alcoholism | a disease that results from the continual misuse of alcohol |
| auditory nerve | a nerve in the ear that carries nerve impulses to the brain. It contains sensory neurons. |
| blood alcohol concentration | a test that determines the level of alcohol in a person's blood. (BAC Test) |
| caffeine | a drug that acts as a stimulant and is present in coffee, many teas, cocoa, and some soft drinks |
| cerebellum | the second largest part of the brain. It coordinates smooth body movement. |
| cerebrum | the largest part of the brain in which the processes of thinking, learning, and reasoning take place. This part allows people to understand and remember ideas. |
| depressant | a drug that decreases the activity of the nervous system. Alcohol is a depressant. |
| drug | a substance, other than food, that can affect the function of body cells and tissues and that produces a change in the body. |
| hallucinogen | a drug that alters perception and awareness. Marijuana is a hallucinogen. |
| illegal drugs | a substance for which use is prohibited by law. Example: heroin |
| medulla | the part of the brain that controls the involuntary functions of the brain, such as heart rate and breathing. It is located in the brain stem and controls automatic functions. |
| motor neuron | a nerve cell that carries impulses from the brain and spinal cord to muscles and glands in the body. |
| narcotic | a habit-forming drug that depresses the function of the brain and nervous system (morphine and heroin) |
| nerve impulse | a message carried through the body by neurons. They pass from one neuron to another as they move through the body. |
| neurons | nerve cells found throughout the body. |
| nicotine | a drug found in the tobacco plant. |
| optic nerve | a bundle of neurons that carries impulses from the eye to the brain. If it is damaged, messages from the eye cannot be received by the brain. |
| receptors | a sensory neuron that receives stimuli from the environment. These neurons in the skin make it possible for people to feel heat, cold, pressure, touch, and pain. |
| reflex | a simple behavior pattern involving an automatic response to a stimulus. |
| sensory neuron | a nerve cell that carries impulses from the senses to the brain and spinal cord. |
| steroids | a drug that helps to build up muscle tissue and strength |
| stimulant | a drug that increases the activity of the nervous system (nicotine and coffee) |
| stimuli | an event or environmental condition that triggers a nerve impulse, thus causing an organisam to respond. |
| taste bud | a receptor on the surface of the tongue that responds to different substances and makes it possible to taste. The four basic tastes are bitter, sour, sweet, and salty. |
