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action potential

sequence electrical changes when a nerve cell membrane is exposed to a stimulus that exceeds its threshold

autonomic nervous system

portion of nervous system that controls actions of viscera and skin


nerve fiber that conducts nerve impulse away from neuron cell body

central nervous system (CNS)

portion of nervous system that consists of the brain and spinal cord


nerve impulses arriving at the same neuron


nerve fiber that transmits impulses impulses toward neuron cell body


a neuron sending impulses to multiple other neurons


muscle or gland that responds to stimulation


subthreshold stimulation of a neuron that makes it more responsive to further stimulation


mass of neuron cell bodies, usually outside central nervous system


three membranes that cover the brain and spinal cord


fatty material that forms sheathlike coverings around some nerve fibers


sheath formed from Schwann cells on outside of some nerve cells


chemical that axon ends secrets to control another neuron or an effector

nissl body

rough membraneous sacs aka: chromatophilic substance

parasympathetic nervous system

portion of autonomic nervous system that arises from brrain and sacral reigons of spinal cord

peripheral nervous system (PNS)

portions of nervous system outside central nervous system


network of interlaced nerves or blood vessels


rapid automatic response to a stimulus

sensory receptor

specialized structure associated with the peripheral end of a sensory neuron specific to detecting a particualr sensation and triggering a nerve impulse in response

somatic nervous system

motor pathways of peripheral nervous system that lead to skeletal muscles

sympathetic nervous system

portion of autonomic nervous system that arisees from thoracic and lumbar reigons of spinal cord


junction between axon of one neuron and dendrite or cell body of another neuron

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