PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Caffeine is a stimulant, which means it increases activity in your brain and nervous system. It also increases the circulation of chemicals such as cortisol and adrenaline in the body. In small doses, caffeine can make you feel refreshed and focused.

Detailed explanation-2: -Solution: Heroin is a depressant and slows down body functions. Cocaine, caffeine and amphetamines are stimulants.

Detailed explanation-3: -Caffeine is a naturally occurring central nervous system (CNS) stimulant of the methylxanthine class and is the most widely taken psychoactive stimulant globally.

Detailed explanation-4: -The stimulants may be divided into three categories based on chemical structure: amphetamine (dextro-amphetamine and levo-amphetamine), methamphetamine and methylphenidate (dextro-methylphenidate and levo-methylphenidate).