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BIOPSYCH
Synaptic Transmission
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Cards (8)
Synaptic Transmission
1. Neurotransmitters released from
pre-synaptic
neuron into
synaptic
cleft
2. Neurotransmitters
bind
to
receptor
sites on
post-synaptic
neuron's
dendrites
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Neurotransmitters
Chemical
messengers released by
neurons
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Excitatory
neurotransmitters
Make it
more
likely for
action potential
to be developed in
postsynaptic
cell
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Inhibitory
neurotransmitters
Make it
less
likely for
action potential
to be developed in postsynaptic
cell
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Action potential
Electric
message
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Synaptic Transmission steps
1. Action potential travels down
presynaptic
neuron axon
2. Synaptic
vesicles
merge/
fuse
with presynaptic cell
membrane
and release
neurotransmitters
into synaptic cleft
3.
Postsynaptic
neuron
receptors
on
dendrite
membrane
detect
neurotransmitters
4. If postsynaptic neuron passes a
threshold
= new
action potential
and passes message on
5. Neurotransmitters
detach
from receptors for the
reuptake
process - transport
proteins
returning them to the
presynaptic
cell
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Excitation
Increased likelihood of new
action
potential
formation in
postsynaptic
cell; become
depolarised
when excitatory neurotransmitters
detected
by receptors -
electrical
charge becomes more
positive
and likely to
fire
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Hyperpolarised
Opposite
of excitation, when
inhibited
neurotransmitters are detected
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