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Chapter 2
Psychology A Journey
17
Physiology
Undergraduate 1
03/30/2009

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Term
An individual nerve cell.
Definition
Neuron
Term
Neuron fibers that receive incoming messages
Definition
Dendrites
Term
The main body of a neuron or other cell.
Definition
Soma
Term
Fiber that carries information away from the cell body of a neuron.
Definition
Axon
Term
Branching fibers at the ends of axons.
Definition
Axon terminals
Term
The electrical charge of a neuron at rest.
Definition
Resting potential
Term
The nerve impulse
Definition
Action potential
Term
The nerve impulse.
Definition
Action potential
Term
A drop in electrical charge below the resting potential.
Definition
Negative after-potential
Term
The microscopic space between two neurons, over which messages pass.
Definition
Synapse
Term
Any chemical released bya neuron that alters activity in other neurons
Definition
Neurotransmitter
Term
Brain chemicals, such as enkephalins and endorphins, that regulate the activity of neurons.
Definition
Neuropeptides
Term
The capacity of the brain to change in response to experience.
Definition
Plasticity
Term
The production of new brain cells.
Definition
Neurogenesis
Term
A bundle of neuron fibers.
Definition
Nerve
Term
The brain and spinal cord
Definition
Central nervous system
Term
All parts of the nervous system outside of the brain and spinal cord.
Definition
peripheral nervous system
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