Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In a chemical synapse, neurotransmitters are released only from the pre-synaptic terminal and their specific receptors are present only on the post-synaptic membrane. Reason (R): Transmission of a nerve impulse across a chemical synapse is strictly unidirectional. In the light of the above statemen

Step-by-step solution

In a chemical synapse, synaptic vesicles containing neurotransmitters are located only in the pre-synaptic terminal, and specific receptors for these neurotransmitters are located exclusively on the post-synaptic membrane. Thus, the Assertion is correct. This structural asymmetry ensures that a nerve impulse can only travel in one direction (from the pre-synaptic to the post-synaptic neuron). Thus, the Reason is also correct. However, the structural arrangement (Assertion) is the cause of the unidirectional transmi