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L-type calcium channel
The L-type calcium channel is a type of voltage-dependent calcium channel. Like the others of this class, the α1 subunit is the one that determines most of the channel's properties.
L-type channels are selectively blocked by dihydropyridines.
In skeletal muscle, there is a very high concentration of DHP receptors, representing L-type calcium channels, situated in the T-tubules. Muscle depolarization results in large gating currents, but anomolously low calcium flux, which is now explained by the very slow activation of the ionic currents. For this reason, little or no Ca2þ passes across the T-tubule membrane during a single action potential.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "L-type_calcium_channel". A list of authors is available in Wikipedia.|