Which of the following is NOT a component of a reflex arc?

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Integrator

Effector

Stimulus

Receptor

answer is D.

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Detailed Solution

A reflex arc is a neural pathway that mediates a reflex action. It involves several components, including a receptor, a sensory neuron,a system (CNS), an integrating centre, and a motor neuron and effector.

The stimulus is the external or internal environmental change that triggers the reflex. It is not considered a component of the reflex arc, but rather the initial trigger that initiates the sequence of events.

Hence, the correct option is stimulus.

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