P/Q-type calcium channel

P/Q-type calcium channels are specialized protein pathways in nerve and muscle cells that allow calcium ions to enter when an electrical signal occurs. These channels are crucial for releasing neurotransmitters—the chemicals neurons use to communicate—and for muscle contraction. They are called "P/Q-type" based on their distinctive properties and where they were first discovered. When an electrical signal reaches the nerve ending or muscle cell, P/Q-type channels open, letting calcium in, which triggers essential responses for nerve signaling and muscle function. Proper functioning of these channels is vital for normal nervous system and muscle activity.