These notes have unit 1 stuff about the nerve cells and processes in the voltage gated channels in the cell membranes of neurons. Moreover it describes structure of neurons and has many diagrams of how neurotransmitters go around the nervous system, how drugs like paracetamol are transported.
difference defined the electric charge between electric
is or
potential difference
per
unit
,
two
points in an
field.
Voltage v
·
is d ow n or
·
The
voltage/potential difference given the force to the electrons to flow through the circuit.
~
esting potential Not and t
pump.
When
·
the The
·
neuron is
reting (in between impulsed it her protein in the axonwell membrane /carrier proteins , pick up
well of the well. lagers
.
a
negative resting potential across the membrane . sodium low and transport them out 2
Phospholipid bilayer
per atten
millivolte o fewer positives inside the some H= 0
·
require energy
Cosmosis)
wegerophetic
· Inside it i s70 mr lower
- in
the it is on the outside , when inside
the axon is
resting 3 Not-> out of membrane
Na
.
neuron
S gaten)
attractte in 2kt
Kt
your in nevron well
=-
membrane
in
-
Role myelinated
#voltage
neuron
-
-
----
:
t
axon -
>
V /
will make
resides node of
und
more ranvier
activa membrane
gen the calcium
Itallow
M
· actiona
gated channels. to
whereincan
Pret
a
·
o
transmitters live :
neuro
serotonin
freely
dopamine
only in insulated
.
concentration .
,
oxytoxin neurons
>
- high to
low
by myelin .
· uptit
n
-
↑
·
↓
·
By jumping from I mode
along the myelinated nerve fibre ,
the nerve
impulses in
vibrating neurons
travel
rapidly
con
along very nar row I small fibres .
This
· allows
for the
development of complex and complete nervous system .
· action potentials can
only occur at the moder , so
they appear to
jump from one to the next.
peach meet
.
.
threshold value .
Resting potential
The whereI neorour
junction potential, a n impulse at
·
When not
transmitting the
·
a neuron is an action
mode of ranvier) and is at .
rest
· At the the neurons do not
synapse ,
touch
actively transporting
and a re
separated by a · However , the neuron is sodium ions out of the membrane
nar row
gap called maintain
synaptic cleft the membrane.
-
and to
potassium lon in the neuron
through a
.
: That's
theverrowcorryanaptic
where the
to of the
impulse in to negative potential in the inside of the neuron , compared the outside
cell Here's an
example :
was
.
neuron ,
0 The membrane is more
millivolts
called
narrythe
Neuros that
o
impose is
permiable to
potassium -
presynaptic
ion .
·
Neurons that
carry
the impulse away is called
for every 3 sodium ion,
,
·
post synceptic neuron .
actively transportedoutside
of the membrane only :
Information passes across the
synaptic cleft from
,
the presynaptic neuron to the
post-synaptic o 2
potassium ions are
neron in the form of chemicals called transported inside of the
neurotransmitters. diffusion
by which triggers membrane .
an action
potential in the
post-synaptic neuron .
I
n
Action potential
The impulse. results
of the electrical potential which from the process of the one
moving
in and out of the neuron cell membrane when the correct channels are
open in response
stimulus inside
to a , making the of the ver ron to be more
positive
than the outside.
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