Calcium channels in the body are very important for life. "A calcium channel is an ion channel which shows selective permeability to calcium ions. It is sometimes synonymous as voltage-gated calcium channel,[1] although there are also ligand-gated calcium channels.[2]"
https://en.wikipedia.org/wiki/Calcium_channel"Voltage-gated calcium channels (VGCCs), also known as voltage-dependent calcium channels (VDCCs), are a group of voltage-gated ion channels found in the membrane of excitable cells (e.g., muscle, glial cells, neurons, etc.) with a permeability to the calcium ion Ca2+.[1][2]"
https://en.wikipedia.org/wiki/Voltage-gated_calcium_channelBesides the voltage-gated calcium channels there is a merely chemically working of calciums channels:
"In coordination chemistry, a ligand[help 1] is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex."
https://en.wikipedia.org/wiki/LigandSource:
Was Funkstreß mit Deinen Zellen macht, Teil 1 - Richard Neubersch & Robert Barring
https://www.youtube.com/watch?v=CbOH1WRueQsBrett A. Simms1 and Gerald W. Zamponi
Neuronal Voltage-Gated Calcium Channels:
Structure, Function, and Dysfunction
in: Neuron Volume 82, Issue 1, 2 April 2014, Pages 24-45
http://www.worldcat.org/oclc/863027687https://ac.els-cdn.com/S08966273140...5459273_c115837682d35b47c5a25789241fe3e7
