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Write the source and the effect on the human body of the following drugs: 

(i). Morphine

(ii). Cocaine

(iii). Marijuana

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(i) Morphine: It is obtained from poppy plant Papaver somniferum. It binds to specific opioid receptors present in central nervous system and gastrointestinal tract.

(ii) Cocaine: It is obtained from coca plant Erythroxylum coca. It interferes with the transport of the neurotransmitter dopamine.

(iii) Marijuana: It is obtained from Cannabis sativa. It affects the cardiovascular system of the body.

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