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| contact w/ environment and carry signals TOWARD brain |
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| plentiful, convey info from one internal processing site to another |
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| carry messages and commands AWAY from CNS to muscles and glands |
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| maintain neurons, compromise the myelin sheath |
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| automatic reactions that are controlled by the spinal chord pathways, no initial input from brain |
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| branch-like fibers that RECEIVE chemical info from other neurons |
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| main body of neural cell, processes chemical info received from dendrites and also stores the DNA |
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| tail like part of neuron that transmits electrochemical signals from soma |
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| electrochemical message that fires from the axon hillock through the axon to the terminal buttons |
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| tiny swellings at the end of the axon which CONTAIN NEUROTRANSMITTERS to be released to the synaptic gap |
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| fluid filled gap between neurons |
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| flow of electrochemical message |
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Definition
| picked up by dendrites, organized by soma, release through axon, and exits through terminal buttons |
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Definition
| tiny electrical charge in place between the inside and outside of resting neurons |
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| maintains slight NEGATIVE charge inside the neuron |
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| hyperpolarization, the charge inside the neuron becomes more negative moving toward resting potential and the action potential does not fire |
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Definition
| depolarization ion channels open, charge moves toward zero becoming less negative and action potential fires through the axon |
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Term
| characteristics of action potential |
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Definition
| fires in an ALL OR NONE fashion through the axon like a gun wit consistent intensity |
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Definition
| interact chemically why postsynaptic membranes of other neurons |
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| acts as a major messenger in central and peripheral nervous system, lack of this causes Alzheimer's |
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| produces mostly inhibitory effects that stabilize neural communications |
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| excessive dopamine levels, hallucinations and delusions |
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| lack of dopamine, L-dopa, tremors and other movement problems |
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| affects sleep, dreaming, and general arousal, depression and OCD are related to an imbalance of this |
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Definition
| mimic the action of neurotransmitters |
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| block the effects of neurotransmitters (curare blowdarts cause paralysis) |
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| morphine like chemicals in the brain that are released to kill pain (runners highs) |
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