Which one of the following depicts the correct circuit of a reflex

Which one of the following depicts the correct circuit of a reflex arc?

[amp_mcq option1=”Effector—sensory neuron—spinal cord—motor neuron—receptor” option2=”Receptor—sensory neuron—spinal cord—motor neuron—effector” option3=”Receptor—sensory neuron—brain—motor neuron—effector” option4=”Sensory neuron—receptor—brain—effector—motor neuron” correct=”option2″]

This question was previously asked in

UPSC NDA-2 – 2018

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The correct sequence of components in a typical reflex arc is Receptor → Sensory neuron → Spinal cord (integration center) → Motor neuron → Effector.

– A reflex arc is the neural pathway that mediates a reflex action.
– The receptor detects the stimulus.
– The sensory (afferent) neuron transmits the impulse from the receptor towards the central nervous system (CNS).
– The integration center (in simple reflexes, often the spinal cord) processes the signal.
– The motor (efferent) neuron transmits the impulse from the CNS to the effector.
– The effector (muscle or gland) carries out the response.

In a simple monosynaptic reflex arc, the sensory neuron synapses directly with the motor neuron in the spinal cord. In polysynaptic reflexes, interneurons are involved between the sensory and motor neurons. While the brain can be involved in modulating reflexes or perceiving the stimulus, the basic reflex arc for many rapid reflexes is processed in the spinal cord.

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