Nerve cells operate by sending
←
NERVE CELL FUNCTION
impulses ( called action potential) from the cell
electrical
body to nerve terminals This allows
.
body
' '
NEURON CLASSES communication between neurons ,
where the response travels through the .
Afferent from tissues / organs outside of CN5
neurons : to central nervous
system . Cell
body
Interneurons within and its within CN5
: connects neurons the CNS ,
entirely the .
and dendrites CN5
Efferent neurons :
Away from CN5 to effector organs Cell .
body are within the .
MYELINATED NEUROTRANSMITTER Myelin sheath provides insulation to
MICROTUBULE
NERVE CELL NEURO FIBRILS prevent current passing through axon
DENDRITES
DIAGRAM .
synapse aswell as
speeding up the
NUCLEOLUS
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NUCLEUS CLEFT
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MICROTUBULE
Local lidocaine inhibit
ACTION POTENTIAL SMOOTH ER anaesthetics such as voltage
•
threshold gated sodium channels and
Nerve cells have a
reversibly block nerve
level of depolarisation to
trigger AP impulse generation This prevents the
-
necessary . .
•
Causes sensation of brain
pain from reaching the .
Opening sensitive Nat and Kt channels NEUROTRANSMITTERS
-
of voltage .
Nat enters cell due to electrical gradient secreted
•
+ concentration A chemical substance
.
by
Kt moves out due to cone
grad hampered by grad used
•
but electric neurons to transmit
, .
messages
•
Not enters the channel closes
slowly . then
Kt
grads
•
exit now due to both ,
so potential drops .
?⃝
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