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tashina tashina
wrote...
Posts: 4
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11 years ago
Chemical synapses transmit information from the sending (presynaptic) cell to the receiving (postsynaptic) cell in the form of neurotransmitters. The release of neurotransmitter into the synaptic cleft and the resulting changes in the membrane potential of the postsynaptic cell (postsynaptic potentials) all depend on the presence of several different types of gated ion channels and the distribution of these channels in the pre- and postsynaptic cells. The image here illustrates a chemical synapse.
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Replies
wrote...
11 years ago
Voltage-gated Na+ and K+ channels are found only in membranes that propagate action potentials. Membranes found in a chemical synapse that propagate action potentials are the membrane of the synaptic terminal, including the presynaptic membrane, and the membrane of the axon hillock (and axon) of the postsynaptic neuron.

Voltage-gated Ca2+ channels, which help regulate the release of neurotransmitter from the presynaptic neuron, are found only in the presynaptic membrane. Ligand-gated ion channels, which open in response to neurotransmitter in the synaptic cleft, are found only in the postsynaptic membrane.

Finally, there are no gated ion channels in the plasma membrane of the cell body of the postsynaptic cell. For this reason, postsynaptic potentials are not propagated along the membrane of the postsynaptic cell in the same way that an action potential is propagated along a membrane containing voltage-gated Na+ and K+ channels.
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Answer accepted by topic starter
laydej4lyfelaydej4lyfe
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Posts: 4
11 years ago
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Related Topics

wrote...
11 years ago
There are no gated ions channels in the plasma membrane!
wrote...
11 years ago
Always remember that the Na can only create an action potential once it reaches the axon hillock!
wrote...
11 years ago
Thanks for this! Slight Smile
mich289
wrote...
10 years ago
Remember, postsynaptic potentials are not propagated along the membrane of the postsynaptic cell because there are no gated ion channels in the plasma membrane of the cell body of the postsynaptic cell.
wrote...
10 years ago
This is exactly what I needed, thanks so much for the help! Slight Smile
wrote...
10 years ago
What is the difference between synaptic, pre synaptic and post synaptic cells?
wrote...
Valued Member
Educator
10 years ago
pre synaptic

Where the neurotransmitter is released.

post synaptic cells?

This is where the neurotransmitters bind and subsequently initiate an action potential.

moekohunter
wrote...
10 years ago
Thanks this helped!
wrote...
10 years ago
It's important to point out that postsynaptic potentials are not propagated along the membrane of the postsynaptic cell since there are no ion channels in the plasma membrane of the cell body of the postsynaptic cell.
wrote...
9 years ago
So, Because the ATP production is created by the ETC, you have considered that in your answer
wrote...
8 years ago
thank you!
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