Of course, not everyone feels that way during a closed-bore MRI, but itâs something to be wary of just in case. What if You Donât Think a Closed-Bore MRI Will Work For You? Thereâs two major reasons that someone might feel like they cannot undergo an MRI in a closed-bore machine.
estivation n 1: (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period [syn: {aestivation}] 2: (botany) the arrangement of sepals and petals in a flower bud before it opens [syn: {aestivation}]
Inactivation and closure is an intrinsic property of that type of calcium channel, and the channels do not REACTIVATE until the cell returns to being polarized once again. This inactivation is what limits the amount of calcium flux INTO the cell, which as mentioned in the other answer can be toxic to the cell.