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Zoology Question 44 – AP-EAMCET 2025

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Study the following and identify the correct option. Statement I : Synaptic transmission occurs in one direction from presynaptic neuron to post synaptic neuron. Statement II : The presynaptic membrane contains receptors for neurotransmitters

Recall the fundamental direction of nerve impulse transmission across a synapse.

Step 1: Analyze Statement I: Direction of Synaptic Transmission✦ Active

Synaptic transmission is the process by which neurons communicate with each other across a synapse. This process is strictly unidirectional. Neurotransmitters are released from the presynaptic terminal and bind to receptors on the postsynaptic membrane, causing a response in the postsynaptic neuron. This ensures that the nerve impulse travels in one direction only, from the presynaptic neuron to the postsynaptic neuron. Therefore, Statement I is correct.

Step 2: Analyze Statement II: Location of Neurotransmitter Receptors○ Expand

Neurotransmitter receptors are specialized proteins that bind to neurotransmitters and initiate a response. These receptors are predominantly located on the **postsynaptic membrane** of the neuron, which receives the signal. The presynaptic membrane is primarily responsible for the synthesis, storage, and release of neurotransmitters into the synaptic cleft. While some presynaptic autoreceptors exist to regulate neurotransmitter release, the general and primary location for neurotransmitter reception is the postsynaptic membrane. Therefore, Statement II, which states that the presynaptic membrane contains receptors for neurotransmitters, is incorrect.

💡 Teacher's Secret Hint

Remember that the presynaptic terminal's main role is to release neurotransmitters, while the postsynaptic membrane's main role is to receive them via receptors.

Step 3: Evaluate Options○ Expand

Based on the analysis, Statement I is correct, and Statement II is incorrect. This corresponds to option 2.

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