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Copy of Differences between Impulse Transmission along the Axon and

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Goh Ai Ping

on 13 April 2014

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Transcript of Copy of Differences between Impulse Transmission along the Axon and

calcium ions??
neurotransmitter molecules??
THE
END

Impulse Transmission along Axon
along axon of
one
neurone
no synaptic cleft
Chemical Synaptic Transmission
across a synaptic cleft between
two
neurones, presynaptic neurone and postsynaptic neurone
Transmission
involves
Nerve Impulse
Impulse Transmission
along Axon
electrical

in nature
involves propagation of electrical impulse along axon
Chemical Synaptic Transmission
presynaptic neurone releases neurotransmitter that diffuse across synaptic cleft and generates electrical impulse
Differences between
Impulse Transmission along the Axon
and
the
Chemical Syanaptic Transmission

Impulse Transmission
along Axon
calcium ions required
release of neurotransmitter molecules
Chemical Synaptic Transmission
influx of calcium ions
release of neurotransmitter

Impulse Transmission
along Axon
electrical impulse generated are
excitatory
Chemical Synaptic Transmission
synaptic transmission can be
excitatory or inhibitory
Impulse Transmission
along Axon
Chemical Synaptic Transmission
due to influx of
sodium
ions
into
the axon

in
excitatory
synapse,
due to influx of
sodium
ions
into
postsynaptic neurone
in
inhibitory
synapse,
due to
facilitated diffusion of chloride
ions
into
postsynaptic neurone OR
potassium
ions
out
of the neurone (hyper polarised)

DEPOLARISATION
REPOLARISATION
due to
potassium
ions diffusing
out
of axon
Recovery
working of

sodium-potassium pump

and

efflux of potassium ions

from the axon
Impulse Transmission
along Axon
removal of neurotransmitter by direct uptake into synaptic bulb or enzymes released to

degrade neurotransmitter
Chemical Synaptic Transmission
action potential
OR
synaptic transmission
Impulse Transmission
along Axon
Chemical Synaptic Transmission
generated and propagated
rapidly
slowly
- time required for neurotransmitter molecules to diffuse across synaptic cleft
All-or-nothing response
temporal summation or spatial summation
AFTER ACTION POTENTIAL...........
Impulse Transmission
along Axon
Chemical Synaptic Transmission
SHORT
refractory period
endogenous transmission of action potentials along axon is
UNIdirectional
NO
refractory period
release of neurotransmitters is
UNIdirectional
- only from synaptic knob of presynaptic neurone
to ensure to transmission is in
one direction
SPEED OF TRANSMISSION
Impulse Transmission
along Axon
Chemical Synaptic Transmission
determined by
diameter
of the
axon
presence or absence of
myelin sheath
Altered by
drugs
- curare & cocaine
Full transcript