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If the sensory nerve in a reflex arc is normal but the intermediate nerve pathway is blocked, what is the most likely result?

Answer and explanation

Correct answer: The stimulus will be detected, but the response may be blocked

The governing concept is the reflex arc, which includes a receptor, sensory neuron, relay neuron, motor neuron and effector. A normal sensory nerve can carry information from the receptor to the nervous system, so the stimulus may be detected. However, blockage in the relay pathway prevents or weakens transmission to the motor neuron and effector. Therefore, option A is correct; B ignores the need for a nerve signal, while C and D are unrelated.

Related tags

Control CoordinationReflex ArcNerve PathwayReflex ActionControl And CoordinationScienceClass 10 Mcq

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