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Nerves full a level summary

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These notes helped me get into medical school, I completed my a levels at Guildford high school which consistently ranks among the top schools in the UK and is known for their academic rigour. I made these notes as a summary of the power points that we were taught off of.

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  • August 25, 2024
  • 1
  • 2024/2025
  • Summary
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40
nodes Of




↓&
resting >Natout/2kt in -
E
depolarisation only
J
-

raviner
-


e
-
- occurs
↓-
-
---
to kt
O
-




Leakey Axon
at nodes
allowing
N
of raviner

Schwann
the impulse to 'jump'
depolarisation
- 40

Threshold
-
Nat open cells



- Isaltatory
-
-




-
+
+ conduction(
-
68
-
k" closed +
+

+
-
Propagation
repolarisation -
Nat closed
Nat



& "It
#
wa
& -

↳Open refractory period
propagation direction
> ensures is
only
ane
i
Nat


& hyperpolarisation-k"closes
III 1 produces discrete impulses
·


zist


limits
·

strength of an impulse



·
action potential arrives




e
Spatial summation Temporal summation

Ca+ channels open vesicles
causing
·




-several
presynaptic
-
several impulses from
to release neurotransmitter

E neurotransmitter binds with receptors
neurons contribute to a
single presynaptic
/Neurotransmittera
⑳ O
·




· reach a threshold neurone to build up
a
C



·
-
-
-
opening Nat channels neurotransmitter

L- U
-


O...
I
I
presynaptic
membrane
·
neurotransmitter broken down by an
↓ G &N




&
I M v
/
-- Y ↑




:
on nd




&
M
enzy da




o
= synaptic
O
Deft
Nat
&- 11-I 1"Il
-


-
6 postsynaptic
membrane



stretch-mediated Nat channels open when

Agonists <
drugs that stimulate
pressure applied causing depolarisation of
Antagonists ,
drugs that inhibit the neuron

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