PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Caffeine is a drug that stimulates (increases the activity of) your brain and nervous system.

Detailed explanation-2: -A type of drug that increases the levels of certain chemicals in the brain and increases alertness, attention, energy, and physical activity. Central nervous system stimulants also raise blood pressure and increase heart rate and breathing rate.

Detailed explanation-3: -Stimulants are a class of drugs that speed up messages travelling between the brain and body. They can make a person feel more awake, alert, confident or energetic. Stimulants include caffeine, nicotine, amphetamines and cocaine.

Detailed explanation-4: -Methamphetamine is a powerful central nervous system stimulant.