A : Transmission of the nerve impulse across | vedclass

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(A) The transmission of nerve impulses across a synapse occurs via two main types: chemical and electrical.In a chemical synapse,the membranes of the

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The transmission of nerve impulses across a synapse occurs via two main types: chemical and electrical.In a chemical synapse,the membranes of the pre-synaptic and post-synaptic neurons are separated by a fluid-filled space called the synaptic cleft (approximately $20-30 \ nm$ wide).Because of this physical gap,the electrical impulse cannot jump directly; therefore,chemicals called neurotransmitters are released from the pre-synaptic neuron to bridge the gap and stimulate the post-synaptic neuron.In contrast,electrical synapses have a very narrow gap (approximately $0.2 \ nm$),allowing for direct electrical transmission without neurotransmitters.Since the assertion describes the general mechanism of synaptic transmission (chemical) and the reason correctly identifies the presence of the synaptic cleft as the cause for requiring neurotransmitters,the reason is the correct explanation of the assertion.

$A$ : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.
$R$ : Transmission across a synapse usually requires neurotransmitters because there is a small space,$i.e.$,synaptic cleft,that separates one neuron from another.

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$A$ : Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.$R$ : Transmission across a synapse usually requires neurotransmitters because there is a small space,$i.e.$,synaptic cleft,that separates one neuron from another.