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Question

Which amongst the following is a depressant of CNS?

A
Opium
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B
Cocain
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C
Caffeine
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D
Amphetamine
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Solution

The correct option is A Opium
  • A depressant or inhibitory neurotransmitter functions as sedative and tranquillizers. It works by enhancing the effect of a neurotransmitter called GABA whose function is to calm down central nervous system responses. Opium is a sedative which is used to treat anxiety and sleeping disorder.
  • Cocain, caffeine, and amphetamine work as powerful stimulants. A stimulant works by increasing the levels of dopamine in the brain. Dopamine is a neurotransmitter that is associated with attention, pleasure and movement. So, the correct answer is option A.

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