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Definition
| complex communication network in which signals are constantly being transmitted received and integrated |
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| 2 major categories of the nervous system |
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Definition
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Definition
| individual cells in the nervous system that receive intergrate and transmit info |
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basic links that permit communication with in the nervous system
- only communicate with other neurons |
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Definition
contains the nucleus and much of the chemical machinery common to most cells
-- the rest of the neuron is devoted to handling information |
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Definition
| parts of the neuron that are specialized to receive information |
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| a long thin fiber that transmits signals away from the soma to other neurons or to the muscle glans |
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Definition
insulating that encses some axons
--speeds up the transmission of signals that move along the axons |
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Definition
small knobs that secrete chemicals called neurotransmitters
-- where the axon ends |
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Definition
| are chemicals that act as messengers that activate neighboring neurons |
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| a junction where information is transmitted from 1 neuron to another |
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| cells found throughout the nervous system that provide verious types of support for neurons |
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providing nourishment
help remove waste
provides insulation around many axons |
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Definition
| a very brief shift in a neurons electrical charge that travels along an axon |
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Term
| the absolute refactory period |
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Definition
| the minimum length of time after an action potential during which another action potential can begin |
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Definition
a microscopic gap between the terminal button of one neuron and the cell membrane of another neuron
-- signals jump this gap to allow neurons to communicate |
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Definition
| the neuron that sends a signal across the gap |
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Definition
| the neuron that receives a signal across the gap |
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Definition
chemical that transmit information from one neuron to the other
--- most stored in the small sacs or bags |
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Definition
| a voltage change at a receptor site on a post synaptic cell membrane |
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Term
| two types of messages can be sent from cell to cell |
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Definition
1. excitatory
2. inhibitory |
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Definition
| a positive voltage shift that increases the liklihood that the postsynaptic neuron will firw action potential |
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Definition
| a negative voltage shift that decreases the liklihood that the post synapric neuron will firw action potential |
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Definition
| a process in which neurotransmitters are sponged up from the synaptic cleft by the presynaptic membrane |
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Definition
| a chemical that mimics the action of a neurotransmitter |
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