Term
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Definition
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Term
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Definition
neurons outside cns
bring info in and out of cns |
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Term
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Definition
| transmit info from sensors that detect external and internal conditions |
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Term
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Definition
local connectors in brain and ganglia integrate sensory info, 99% of all neurons
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Term
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Definition
collection is a nerve
trigger activity in muscle or glands, transmit output from cns and pns
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Term
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Definition
| sensor-input-brain integration(cns)-motor output(pns)-effector |
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Term
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Definition
cell body
dendrites
axon hilock
axon
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Term
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Definition
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Term
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Definition
| help nurish neurons, support cells, insulate neurons, regulate extracellular fluid, outnumber neurons 10/54 |
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Term
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Definition
cns- structural support
reg. extracellular fluid
help form blood brain barrier
controls concentration of ions and neurotransmitters |
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Term
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Definition
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Term
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Definition
| pns- insulate axon myelin sheath, increase efficiency of signal transmission |
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Term
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Definition
| voltage across membrane due to ion gradients |
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Term
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Definition
selectively premeable, highly to potassium, not as much sodium and chlorine
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Term
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Definition
negative inside na-2 k-3
no anions |
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Term
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Definition
open k channels
gated na+ channels
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Term
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Definition
decrease in magnitude of membrane potential
inflow of (-) ions or outflow of (+) ions
opening of k channels to create more negative inside |
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Term
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Definition
increase in magnitude of membrane potential
involve gated Na channels |
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Term
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Definition
open k channels, gated are shut
depolarization, some gated are open till reaches the threshhold
voltage gated open and influx of Na, k gated closes
falling phase of active potential- gated k open and na flows out
undershoot, hyperpolarizes |
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Term
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Definition
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Term
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Definition
| speen of an AP, increases with the diameter of an axon, myelin increases the speed of the signal, AP in myelinated jumps btw the nodes of ranvier (saltatory conduction) |
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Term
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Definition
| cross synap and react with ligand gates channels on postsynaptic neuron |
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Term
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Definition
| hydrolysis, diffusion, active transport |
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Term
| excitatory postsynaptic potential |
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Definition
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Term
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Definition
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Term
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Definition
| time, two AP's hitting close together |
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Term
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Definition
| 2 ap's get added together |
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