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If a drug prevents the chemical messenger at a synapse from breaking down, what may happen?

Answer and explanation

Correct answer: Excitation in the next neuron may last longer

Chemical messengers released at a synapse stimulate receptors on the next neuron. Normally, removal or breakdown of the messenger helps terminate the signal and prevents continuous stimulation. If a drug blocks its breakdown, the messenger can remain active for longer, so excitation in the next neuron may be prolonged. Option A is correct. The other options describe effects that do not follow synaptic physiology and confuse neural, sensory or endocrine functions.

Related tags

Control CoordinationSynapseSignal DurationControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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