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Gated ion channel

Gated ion channel

(Science: physiology) transmembrane proteins of excitable cells, that allow a flux of ions to pass only under defined circumstances. Channels may be either voltage gated, such as the sodium channel of neurons or ligand gated such as the acetylcholine receptor of cholinergic synapses. Channels tend to be relatively ion specific and allow fluxes of typically 1000 ions to pass in around 1ms, they are thus much faster at moving ions across a membrane than transport atpases.

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Neurobiology Questions

... 3. In the resting, unstimulated neuron, activation gates of most sodium channel are____ inactivation gates of most sodium channels are_____ and activation gates of most voltage-gated potassium channels are ______. A. closed; open; closed B. closed; open; open C. ...

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by biol245
Fri Sep 24, 2010 2:29 pm
Forum: Cell Biology
Topic: Neurobiology Questions
Replies: 0
Views: 4396

Re: The Physics of how the Myelin Sheath actually works.

... faster where the wrapping is. Ahh, so there are still a ton of voltage gated Na+ gates down the myelinated portion of the channel, it's just that these function a lot faster? That makes a lot more sense now, thanks! ...

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by Nebulae
Tue Feb 26, 2008 8:18 am
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 23549

how do proton pumps help regulate the size of stomata?

... a hyperpolarisation of the plasma membrane, which opens a voltage-gated potassium channel, making potassium enter the cell. Then, as it can be seen from Dave's animation, water ...

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by MrMistery
Thu Jan 10, 2008 1:49 pm
Forum: Cell Biology
Topic: how do proton pumps help regulate the size of stomata?
Replies: 2
Views: 5612

Na/K ATP-ase Reversal

I am not sure with your question but I tried to tell this, maybe can explain you ... be found inside the cell. Both Na+ and K+ have channel, which is voltage-gated. When there is an adequate stimulus, Na+ channel will ...

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by Dr.Stein
Wed Feb 21, 2007 7:26 am
Forum: Cell Biology
Topic: Na/K ATP-ase Reversal
Replies: 5
Views: 5455

Nerve Impulses

... compressed. These nerves respond to compression. Voltage gated ion channels, located on the axon, open up. Sodium ions (positively charged) ...

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by Khaiy
Fri Apr 21, 2006 6:44 pm
Forum: General Discussion
Topic: Nerve Impulses
Replies: 2
Views: 2818
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