A plant , native of south america is a source of a drug of addiction which is CNS stimulant. This drug inhabits transport of :-

Options

A. Acetylcholine
B. Dopamine
C. Serotonin
D. Adrenaline

Answer

**Step-by-Step Solution:**

1. **Identify the Plant and Drug**: The question mentions a plant native to South America that produces a drug of addiction and acts as a central nervous system (CNS) stimulant. The plant in question is the coca plant, which is the source of cocaine.

2. **Understand the Drug's Action**: Cocaine is known to be a CNS stimulant. It affects the nervous system by increasing alertness and delaying fatigue.

3. **Mechanism of Action**: Cocaine interferes with the transport of certain neurotransmitters in the brain. Specifically, it inhibits the reuptake of dopamine, a neurotransmitter that plays a crucial role in transmitting signals between neurons.

4. **Role of Dopamine**: Dopamine is a catecholamine that transmits signals across synapses (the gaps between neurons). It is released into the synapse and binds to receptors on the neighboring neuron to propagate the signal.

5. **Effect of Cocaine on Dopamine Transport**: When cocaine is present, it binds to dopamine receptors on the postsynaptic neuron, preventing the normal reuptake of dopamine. This leads to an accumulation of dopamine in the synaptic cleft, enhancing its effects and contributing to the drug's addictive properties.

6. **Conclusion**: The drug cocaine inhibits the transport of dopamine, which is the correct answer to the question.

**Final Answer**: The drug inhibits the transport of **dopamine**.

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