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transmits information to other neurons, muscles, or glands, connects to other dendrites via terminal buttons
electrical signal that travels down axon to synapse; fired when excitatory signals minus inhibitory signals exceed a threshold
stimulation below threshold does not result in an action potential; stimulation at or above threshold is the same action potential
gap between the terminal buttons of the sending neuron and the dendrites of the receiving neuron
chemical messengers that cross synaptic gaps and bind to sites on receiving neurons' dendrites
autoreceptors-relays information at stopping point
peripheral nervous system
sensory and motor neurons that connect the CNS to the body's organs and muscles; consists of the somatic and autonomic nervous systems
somatic nervous system
nerves that convey information into and out of the CNS; can be volunarily controlled to perceive, think, and coordinate behaviors
autonomic nervous system
nerves that involuntarily control blood vessels, body organs, and glands; functions to regulate bodily systems; made up of sympathetic and parasympathetic
the central nervous system
the brain and spinal cord. for very basic behaviors, spinal cord does not need input from the brain
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