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the particles carrying either a positive of a negative electrical charge, most ions inside neurons are negatively charged
theprocess by which one neuron membrane touches another, and the semi permiability goes down, allowing positively charged ions to enter
all or none principal
neurons transmitted signals to other neurons only when depolarization was strong enough to trigger an action potential
white, fatty coating encasing many axons, increases the speed at which the axon conducts neural impulses
glial cells help neurons carry out their goals in three ways
transport nutrients from blood vessels to neurons, some produce the myelin sheath, and change the chances of synaptic transmission
peripheral nervous system
composed of the nerves that branch from the brain and the spinal cord to the body
somatic nervous system
carries messages from the central nervous system to the skeletal muscles that control movements of the body
divisions of the autonomic nervous system
sympathetic nervous system, parasympathetic nervous system
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