The euphoria experienced under the influence of cocaine is caused by which mechanism?

• A. A Blockade of Dopamine Receptors
• B. A Build Up of Neurotransmitters
• C. Inhibition of Monoamine Release
• D. Desensitization of Receptors

Answer: (B)

Cocaine’s euphoria comes from increased dopamine signaling in reward pathways, caused by blocking the reuptake of monoamines. When cocaine inhibits the dopamine transporter, dopamine (and other monoamines) can’t be cleared from the synaptic cleft, so they accumulate and keep activating postsynaptic receptors. This sudden buildup heightens neural signaling in the mesolimbic pathway, especially in areas like the nucleus accumbens, producing the intense pleasurable feelings.

This explains why the option describing a buildup of neurotransmitters is correct: the core effect isn’t blocking receptors, inhibiting release, or desensitizing receptors, but rather keeping more transmitter available in the synapse so the signal is amplified.