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Summary Alevel OCR Biology A notes on Neuronal Communication
Alevel OCR Biology A notes on Neuronal Communication from an A* Biology student. Plus diagrams.
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mentrinsk out
t
④ repolarisation
Neuronal Communication
-sensory rarores reception to CNUS
-
-relay namores: CNS,
in connect motor sensory
-
CNS
motor- effectors
to
Pacinian
-
corpuscles mechanoreceptor deep
=
slim,
in respond to changes in
pressure generator potential
-
=ends of sensory remove axons
-many layers of membrace separated by a
gel (concious Nations)
-stretch mediated Nat channels open with enough pressure NA"=
influx = electrical potential
difference established generator potential (depolarisation
-
-
resting inside
axon= always
axon=
regative electrical potential:
resting potential
difference -70mV
-
potential
=
of
-
Na-K ATP 3 for 2 hic transpared in electro-
pups be
actively transport
to Na icry out axon
every
-
cherical gradient
Nat letmore
-
selective protein channels membrane by facilitated diffusion
=
+ across
↳ Nat=
ls permeable to k tdiffuse back down core gradient
+
at of axon 4
distribution of electrical charge
-
action potential brief change in
I
-rapid movement of Nat netacross
+
axon membrace
-voltage gated channel protine open/close
=
via electrical politic, closed during lost state
N at
stimulus- Natdiffises
channels open- to
in electrochemical gradient
-large enough stimulus delected by remore action
-
potential
-
=
55mv depdarisation.
depdcrisation -55mv, =
voltage gated Nat channels open. Nat with axon=↓
potential difference
↓
midirection al inside of axon becomes less regative:more channels open: ↑ Nat enter (posite (eed)
=action potential -> 30mv
+
repolarisation:
all Nat voltage
galed channel proteins close + k voltage galed charrels opel=
-
↳ ditases our of axon retur n
=
polental die to -70mV
hyperpolarisation:a tchannels slow closet
to too
may
bediffuse o u t :
potential dif=Pregative
i tchannels close, Na-h purp
resting polental: restores resting potential
is
-> preciate section mopasie
-action potential triggered neurore
in
depolarisation:Nat
= Nat instux=action
charrels open: potential (discrete +
midirectionals
-All nothing principle-stimulus:strong enough to i above threshold
or receptor potential potential:stimulate
semary remove to
send impulses
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