An itch receptor in your skin sends a message to the brain, which then sends a message to the hand to scratch the itch. This process involves which of the following nerves, in the correct order?

Sensory nerve; motor nerve
Motor nerve; sensory nerve
Interneuron; efferent neuron
Efferent neuron; interneuron

The nervous system in the body is responsible for sending and receiving messages. The sensory and the motor neurons are responsible for sending and receiving messages from nerve cells to organs and vice versa.

The correct answer is:

Option A. Sensory nerve; motor nerve

This can be explained as:

The afferent fibers are present in the sensory nerve cells and carry the message from the muscles to the CNS.

The motor nerves have efferent fibers and carry messages from CNS to the muscles for action-reaction.

Therefore, it is sensory and motor nerve.

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