The correct answer to your question is:
A. Signals form from sensory neurons reach motor neurons through interneurons in the brain and spinal cord that connects sensory neurons and motor neurons.
Here’s a brief explanation of how this process works:
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Sensory neurons detect stimuli (like touch, temperature, pain, etc.) and send electrical signals (action potentials) to the spinal cord and brain.
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Interneurons act as connectors and processing units. In the spinal cord and brain, they receive signals from sensory neurons. They integrate this sensory information and can relay signals to motor neurons, facilitating reflexes or voluntary movements.
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Motor neurons then receive the processed signals from the interneurons and transmit signals to muscles, causing them to contract and produce movement.
This pathway allows the body to respond effectively to stimuli from the environment through coordinated neural processing.