chemical transmition across a synapse

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  • Created by: nkelly
  • Created on: 17-04-18 09:45
step 1
action potential arrives at synaptic bulb
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step 2
k+ channels open in presynaptic membrane. Calcium ions diffuse into neuron membrane down concentration gradient.
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step 3
as calcium concentration increases the synaptic vesticles containing neurotransmitters move toward presynaptic membrane.
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step 4
the vesicles fuse with membrane and release the chemicals into synaptic cleft.
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step 5
Neurotransmitters diffuse across synapse cleft known as SYNAPTIC DELAY because slower than electron signal travels
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step 6
The neurotransmitter binds to post synaptic cell membrane receptor sights on na channels
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step 7
Some neurotransmitters open na channels in membrane causing na ions to pass in. This creates a excitatory postsynaptic potential (EPSP) and makes membrane receptive to signals coming in. If this reaches reaches the threshold then atp generated.
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step 8
The neurotransmitter will excite cell and once it has acted on membrane, enzymes act on neurotransmitters to break it down.
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Other cards in this set

Card 2

Front

k+ channels open in presynaptic membrane. Calcium ions diffuse into neuron membrane down concentration gradient.

Back

step 2

Card 3

Front

as calcium concentration increases the synaptic vesticles containing neurotransmitters move toward presynaptic membrane.

Back

Preview of the back of card 3

Card 4

Front

the vesicles fuse with membrane and release the chemicals into synaptic cleft.

Back

Preview of the back of card 4

Card 5

Front

Neurotransmitters diffuse across synapse cleft known as SYNAPTIC DELAY because slower than electron signal travels

Back

Preview of the back of card 5
View more cards

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