Question:
S is the stimulant of central nervous system and interferes with the transport of T, a neurotransmitter. Identify S and T and choose the correct option.
S is the stimulant of central nervous system and interferes with the transport of T, a neurotransmitter. Identify S and T and choose the correct option.
Show Hint
Remember: Cocaine causes a "rush" or euphoria because it leaves Dopamine hanging around in the synapse for a longer period of time by blocking its transport mechanism.
Updated On: Aug 16, 2026
- S – Cocaine, T – Dopamine
- S – Heroin, T – Acetylcholine
- S – Heroin, T – Dopamine
- S – Cocaine, T – Acetylcholine
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
Different classes of drugs interact with unique physiological mechanisms within the human central nervous system (CNS):
• Cocaine: An alkaloid extracted from the plant Erythroxylum coca. It functions as a potent CNS stimulant, inducing euphoria and increased energy by specifically blocking the reuptake transport of the neurotransmitter dopamine.
• Heroin: A semi-synthetic opioid derivative (diacetylmorphine) obtained by acetylation of morphine. It acts as a depressant that slows down bodily functions rather than acting as a stimulant.
Step 1: Identify the stimulant category variable 'S'.
The problem states that 'S' is a powerful stimulant of the central nervous system. This immediately eliminates Heroin from consideration, as Heroin is classified pharmacologically as a depressant. Therefore, 'S' must be Cocaine.
Step 2: Identify the targeted neurotransmitter 'T'.
Cocaine exerts its actions by binding to dopamine reuptake transporters on the presynaptic neuronal membrane. This inhibition prevents dopamine from being cleared out of the synaptic cleft, causing an accumulation of dopamine that continually stimulates post-synaptic receptors. Hence, the neurotransmitter 'T' is Dopamine.
Step 3: Correlate with options.
Matching $S = \text{Cocaine}$ and $T = \text{Dopamine}$ leads directly to Option (A).
• Cocaine: An alkaloid extracted from the plant Erythroxylum coca. It functions as a potent CNS stimulant, inducing euphoria and increased energy by specifically blocking the reuptake transport of the neurotransmitter dopamine.
• Heroin: A semi-synthetic opioid derivative (diacetylmorphine) obtained by acetylation of morphine. It acts as a depressant that slows down bodily functions rather than acting as a stimulant.
Step 1: Identify the stimulant category variable 'S'.
The problem states that 'S' is a powerful stimulant of the central nervous system. This immediately eliminates Heroin from consideration, as Heroin is classified pharmacologically as a depressant. Therefore, 'S' must be Cocaine.
Step 2: Identify the targeted neurotransmitter 'T'.
Cocaine exerts its actions by binding to dopamine reuptake transporters on the presynaptic neuronal membrane. This inhibition prevents dopamine from being cleared out of the synaptic cleft, causing an accumulation of dopamine that continually stimulates post-synaptic receptors. Hence, the neurotransmitter 'T' is Dopamine.
Step 3: Correlate with options.
Matching $S = \text{Cocaine}$ and $T = \text{Dopamine}$ leads directly to Option (A).
Was this answer helpful?
0
0
Top CBSE CLASS XII Biology Questions
- All algae have
- With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
- With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte
- Draw a labeled diagram of male reproductive system.
- Draw a labeled diagram of female reproductive system.
View More Questions
Top CBSE CLASS XII Drugs Questions
- Name the group of drugs whose skeletal molecule is shown below:
- How are such drugs consumed?
The linking of the antibiotic resistance gene with the plasmid vector of Salmonella typhimurium by Stanley Cohen and Herbert Boyer was made possible by the enzyme:
- Select the option that gives the correct identification of ovum, morula, and blastocyst in a human female reproduction system as shown in the following diagram: \textit{(Refer to the provided diagram.)}
- (a) (i) Name the group of drugs whose skeletal molecule is shown below:
\begin{figure}[h!] \centering \includegraphics[width=0.5\linewidth]{Screenshot 20250115 143511.png} % Replace with the correct path to your image \caption{Drug} \label{Drug} \end{figure}
View More Questions
Top CBSE CLASS XII Questions
- 2, b, c are in A.P. and the range of determinant $\begin{vmatrix}1&1&1\\ 2&b&c\\ 4&b^{2}&c^{2}\end{vmatrix}$ is [2, 16]. Then find range of c is
- A boy of mass 50 kg is standing at one end of a, boat of length 9 m and mass 400 kg. He runs to the other, end. The distance through which the centre of mass of the boat boy system moves is
- A capillary tube of radius r is dipped inside a large vessel of water. The mass of water raised above water level is M. If the radius of capillary is doubled, the mass of water inside capillary will be
- A circular disc is rotating about its own axis. An external opposing torque 0.02 Nm is applied on the disc by which it comes rest in 5 seconds. The initial angular momentum of disc is
- A circular disc is rotating about its own axis at uniform angular velocity \(\omega.\) The disc is subjected to uniform angular retardation by which its angular velocity is decreased to \(\frac {\omega}{2}\) during 120 rotations. The number of rotations further made by it before coming to rest is
View More Questions