The nervous system generates a reaction when Lucia steps on a nail by following a chronological sequence of events. Receptors in her toe receive stimuli, the sensory neuron generates an impulse, interneurons relay the impulse to motor neurons in the spinal cord, motor neurons signal the leg muscles, and she immediately moves her foot.
The nervous system works by sending and receiving electrical signals. In the case of Lucia stepping on a nail, her nervous system will generate a reaction to the stimulus.
Here is a step-by-step chronological arrangement of events:
Receptors in her toe receive stimuli.
The sensory neuron generates an impulse.
The impulse is relayed to interneurons in the spinal cord.
Interneurons relay the impulse to motor neurons in the spinal cord.
Motor neurons signal the leg muscles.
She immediately moves her foot.
This sequence of events represents the reflex arc, which is an automatic response that does not require input from the brain.
The sensory receptors in Lucia's toe detect the pain from the nail, which triggers an impulse in the sensory neuron.
The impulse then travels to the spinal cord, where interneurons relay the signal to motor neurons.
The motor neurons then activate the leg muscles, causing Lucia to immediately move her foot.