R-type calcium channel

R-type calcium channels are specialized proteins located on nerve and muscle cell membranes that allow calcium ions to enter the cell in response to electrical signals. They are called "R-type" because they activate at relatively high voltages ("resistant" to certain blocking agents). Once open, calcium influx helps regulate processes like neurotransmitter release and muscle contraction. These channels play a crucial role in the nervous system by supporting sustained activity and signal transmission, contributing to how our brain and muscles communicate effectively.