Definition of "calcium ion" []

• Ion of calcium; a factor in the clotting of blood (noun)

WordNet. Princeton University. 2010.

• "During its period of activity, protein kinase aids in phosphylating proteins that open calcium ion channels to increase calcium action in the neuron, leading to a biological response such as the release of a neurotransmitter from the axon bulb."
• "These calcium ion channels can be closed by the action of an enzyme called phosphoprotein phosphatase which dephosphorylates the proteins."
• "calcium ion channels dephosphorylated proteins that shut off the calcium ion channels and bring the system to rest."