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Topic 6
Nervous Coordination
NMJ
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Created by
Saamya M
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Cards (6)
NMJ - point where
motor neurone
meets a
skeletal muscle fibre
NMJ
Always uses
Ach
Postsynaptic membrane
folded into many clefts that store
acetylcholinesterase
NMJ
Always uses
Ach
Postsynaptic
membrane
folded
into many
clefts
that store
acetylcholinesterase
Postsynaptic membrane has
more
receptors
Impulses are always
excitatory
Endpoint
for the
AP
Connects
motor
neurone to
muscle
Neurone synapse
Many
different
neurotransmitters
used
Membrane
smooth
with
acetylcholinesterase
found in
central
cleft
Postsynaptic
membrane has fewer
receptors
Impulses can be
excitatory
or
inhibitory
A new
AP
is generated in the next
neurone
Connects
two
neurones
Describe how the release of Ach into a NMJ causes the cell membrane of a muscle fibre to depolarise (3)
Movement
by
diffusion
Binding to
receptors
on
postsynaptic
membrane
Causing
sodium channels
to open
When an AP arrives at the synaptic cleft it results in the secretion of Ach into the synaptic cleft. Explain how (3)
Depolarisation
of
presynaptic
membrane
Ca2
+
channels
open
Vesicles
fuse with
presynaptic
membrane