ස්නායු සෛලවල ව්යුහය සහ...
DESCRIPTION
ස්නායු සෛලවල ව්යුහය සහ ක්රියාකාරිත්වය හදුනා ගනිමු.TRANSCRIPT
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Upul anuruddha
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, (Internal enviroment) .
(External enviroment) .
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()
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().
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(nerve fibres) .
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() 3 .
() (Sensory neuron)
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(Intermediate neuron) -
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() (Motor neuron) -
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(Synapse) .
3 .
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(neurotransmitters) .
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(Acetylcholine) () , () .
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(Reuptake).
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+
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(Reflex arc).
(Reflexes) .
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/ / 3 .
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(Withdrawal reflex)
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Na+ K + .
(-) (+) .
K+ Na + .
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.......
Na-K Atp ase
Na K .
Na- K Atp ase Na + 3
K+ 2 .
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(+ )
(+) .
K+ Na+ .
K+
K+ .
q (+ ) (+)
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(Resting memberane potentional) .
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-70mv .
K+ .
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Na+ K+ .
Na+ (Influx) Valtage gated Na Channels (70mv - 50mv) .
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(depolarization) .
(Threshold) .
+35mv .
Na channel K+ K+ channels .
(RMP) .
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(repolarization) .
RMP
(hyperpolarization) .
K+ channels
..
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Time (ms)
Me
mb
ran
e p
ote
ntio
na
l(m
v)
-70
-55
0
35
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31
(Na+)
(K+)
(K+)
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. (Refractory period) .
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1/3 .
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2/3
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(relative
refractory period).
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-- --
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(propagation) .
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(Deploarize )
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---- .....
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saltatory conduction .
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