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Why are chemical messengers needed for transmission of a nerve signal at a synapse?

Answer and explanation

Correct answer: Because there is a small gap between two neurons

The governing concept is synaptic transmission. Neurons at a synapse are separated by a microscopic gap, so the electrical impulse cannot simply pass through continuous cytoplasm. When the impulse reaches the axon terminal, it triggers release of neurotransmitter chemicals; these diffuse across the synaptic cleft and stimulate the next neuron. Thus option A gives the necessary reason. The other choices assign impossible functions to the axon, dendrite or spinal cord.

Related tags

SynapseNeurotransmitterNerve-SignalControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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