Gap junction: Difference between revisions
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Gap junction channels link two cells together via electrical [[ | Gap junction channels link two cells together via electrical [[Synapses|synapses]]. In an electrical synapse, either [[Neurone|neurone]] can excite the other and is therefore known as bidirectional. The speed of conduction across an electrical synapse is much quicker than that across a chemical synapse as the [[Cytoplasm|cytoplasm]] is continuous between the cells. The presynaptic cell also does not have to reach a threshold potential in order to trigger an [[Action_potential|action potential ]]in the postsynaptic cell, instead a [[Depolarisation|depolarisation]] is triggered in the postsynaptic cell that is proportional to the electrical current from the presynaptic cell. | ||
Gap channels are composed of two hemichannels, where one hemichannel is situated in each opposed cell. Many thousand gap junction channels can make up an electrical synapse. <ref>Lodish H, Kaiser C, Bretscher A, Amon A, Berk A, Krieger M, Ploegh H and Scott M. (2008) Molecular cell biology, 7th edition, New York: WH Freeman.</ref> | Gap channels are composed of two hemichannels, where one hemichannel is situated in each opposed cell. Many thousand gap junction channels can make up an electrical synapse. <ref>Lodish H, Kaiser C, Bretscher A, Amon A, Berk A, Krieger M, Ploegh H and Scott M. (2008) Molecular cell biology, 7th edition, New York: WH Freeman.</ref> | ||
Revision as of 14:09, 6 December 2014
Gap junction channels link two cells together via electrical synapses. In an electrical synapse, either neurone can excite the other and is therefore known as bidirectional. The speed of conduction across an electrical synapse is much quicker than that across a chemical synapse as the cytoplasm is continuous between the cells. The presynaptic cell also does not have to reach a threshold potential in order to trigger an action potential in the postsynaptic cell, instead a depolarisation is triggered in the postsynaptic cell that is proportional to the electrical current from the presynaptic cell.
Gap channels are composed of two hemichannels, where one hemichannel is situated in each opposed cell. Many thousand gap junction channels can make up an electrical synapse. [1]
References
- ↑ Lodish H, Kaiser C, Bretscher A, Amon A, Berk A, Krieger M, Ploegh H and Scott M. (2008) Molecular cell biology, 7th edition, New York: WH Freeman.