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17 Cards in this Set
- Front
- Back
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Acetylcholine
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Most abundant n.t. in PNS
used in CNS & PNS causes muscle to contract Cholinergic: Nicotinic & Muscarinic |
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nicotinic
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opens channels, causes EPSPs
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muscarinic
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(most common)
opens/closes channels, activates enzymes g-protein response |
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Acetylcholinesterase
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Deactivates acetylcholine
prevents over stimulation |
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Monoamine NTs
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Norepinephrine
Dopamine Serotonin (Epinephrine) |
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catecholamines
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Dopamine, Norepinephrine, Epinephrine
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acetylcholinesterase function
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enzyme decomposes acetylcholine and prepares the synapse to recieve additional nt with the next impulse
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Norepinephrine
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from adrenal medulla as "hormone"
in PNS & CNS binds to adrenergic: alpha & beta synapses with glands, smooth muscle, skeletal cardiac |
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amphetamines
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stimulate pathways that use norepinephrine
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dopamine
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CNS - motor control, behavior
dopaminergic receptors Parkinson's - degeneration of L-Dopa (chemical) Schizophrenia - dopamine excess |
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Long term Potantiation
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improves synaptic transmission as a result of frequent use of the sunaptic pathway.
Mechanism for learning |
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Cerebellum
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input from proprioceptors
fine tunes motor cortex signals |
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Spinal chord
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31 pairs of nerves
links brain and periphery Integrating Center for most reflexes |
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ascending spinal tracts
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transmit sensory info from periphery to CNS
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Descending spinal tracts
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trasmit motor responses FROM CNS to periphery
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Afferent
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sensory neurons info to CNS
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Efferent
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motor neurons away from CNS
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