1. Neurons communicate using both electrical and chemical signals.
    1. Sensory stimuli are converted to electrical signals.
    2. Action potentials are electrical signals carried along neurons.
    3. Synapses are chemical or electrical junctions that allow electrical signals to pass from neurons to other cells.
    4. Electrical signals in muscles cause contraction and movement.
    5. Changes in the amount of activity at a synapse can enhance or reduce its function.
    6. Communication between neurons is strengthened or weakened by an individual's activities, such as exercise, stress, and drug use.
    7. All perceptions, thoughts, and behaviors result from combinations of signals among neurons.

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