Summary
Channel proteins with voltage sensors that open or close to shape action potentials.
In depth
Structure: four domains, S4 voltage sensor, selectivity filter. Na+, K+, Ca2+ families; mutations cause channelopathies like epilepsy, long QT syndrome and cystic fibrosis (a Cl- channel). Patch clamp (Neher and Sakmann) records single channels.
Channels have activation and inactivation gates. Toxins and drugs target specific channels. Mutations cause neurological and cardiac disease.
Example: tetrodotoxin blocks sodium channels.
Frequently asked questions
What is Voltage-Gated Ion Channels?
Channel proteins with voltage sensors that open or close to shape action potentials.
Which area of biology covers Voltage-Gated Ion Channels, and how advanced is it?
Voltage-Gated Ion Channels is one of the 54 topics in Neuroscience. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Depolarisation and Repolarisation, Action Potential, Synaptic Transmission.
Can you give an example of Voltage-Gated Ion Channels?
Carbamazepine blocks sodium channels in epilepsy.
What should I learn before Voltage-Gated Ion Channels?
Work through the Beginner topics in Neuroscience first, such as Nervous System, Neuron, Central and Peripheral Nervous Systems, then return to Voltage-Gated Ion Channels. Advanced topics assume the Intermediate vocabulary.
What topics are related to Voltage-Gated Ion Channels?
The closest topics to Voltage-Gated Ion Channels are Depolarisation and Repolarisation, Action Potential, Synaptic Transmission, Hodgkin-Huxley Model. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Voltage-Gated Ion Channels?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Voltage-Gated Ion Channels. To practise the whole of Neuroscience, use the Neuroscience quiz.
How is Voltage-Gated Ion Channels different from Depolarisation and Repolarisation?
Voltage-Gated Ion Channels: Channel proteins with voltage sensors that open or close to shape action potentials. Depolarisation and Repolarisation: Sodium channels open and the cell becomes positive, then potassium channels open to restore the negative interior. Read both side by side and note what each one explains.
How should I study Voltage-Gated Ion Channels step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Depolarisation and Repolarisation and explain the difference aloud. Finally, take the Neuroscience quiz and come back to this page for any question you miss.