Which statement is not correct for drugs abuse?

(I) Opioid receptors present in our central nervous system and gastro- intestinal tract.

(II) Cannabinoid receptors present principally in the brain

(III) Coca alkaloid has a potent stimulating action on central nervous system

(IV) Coca alkaloid interferes with the transport of the neuro- transmitter dopamine.

(V) Heroin is a depressant and slows down body functions.

(VI) Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery.

(VII) Cocaine producing a sense of euphoria and increased energy.