Matching 1. increases the activity of the central nervous system 2. increases the heart rate and suppresses the appetite 3. first used by europeans as a local anesthetic; now abused for its euphoric effects 4. found in coffee beans, tea leaves, and cocoa beans 5. reduces the activity of the central nervous system 6. suppresses brain activity by blocking the ability of nerves in the brain from sending or receiving signals 7. reduces the physical and psychological symptoms of anxiety by reducing brain activity 8. pain-killing drugs that are derived from opium word bank: barbiturates depressants caffeine tranquilizers narcotics stimulants amphetamines cocaine

1. stimulants
- These are substances that increase neural activity in the Central Nervous System that results to increased CNS activity.
2. Amphetamines
- Amphetamines activate stress or panic signals that heighten brain activity and also cancels hunger signals.
3. cocaine
-Cocaine is a substance derived from the Coca Plant. Dr. Carl Koller in 1884 discovered its anesthetic properties. Its use as a recreational drug started when Arthur Conan Doyle portrayed Sherlock Holmes to use this substance to relieve himself of stress.
4. caffeine
- Widely used around the world, caffeine can be found in cacao, coffee beans, and tea leaves. It is a widely unregulated psychoactive drug that prevents drowsiness and stimulates the central nervous system.
5. depressants
-This is a substance that reduces the function of the brain and nervous system. This is used to treat anxiety by slowing down alertness, breathing and heart rate. 
6. barbiturates
- This is a substance that suppresses brain activity by affecting GABA or Aminobutyric acid, a brain neurotransmitter used to send signals within the brain.
7. Tranquilizers
- This is a drug mainly used to treat anxiety. Brain activity is reduced by inhibiting dopamine, a neurotransmitter that leads to a reduction of hallucinations, and other psychotic symptoms.
8. Narcotics
- This is a substance derived from opium that is known to relieve pain. This substance overcomes the senses and gives the body a sense of relief from pain. The side effect is that it also gives the user a sense of euphoria which is addicting. And that the body builds up resistance to this drug in a matter of days so to continue its use means to introduce increasing amounts in the body.