Ground-Glass Nodules: If Growing, Assume Cancer. Blair Westerly, MD. The more CT scans that are performed, the more ground-glass opacities (GGOâs) are seen and what to do with these abnormalities can be difficult to ascertain for clinicians.
the process of reversing the charge across a cell membrane (usually a NEURON), so causing an ACTION POTENTIAL. In depolarization, the inside of the membrane, which is normally negatively charged, becomes positive and the outside negative.
Action potentials are considered an all-or nothing event. Once the threshold potential is reached, the neuron completely depolarizes. As soon as depolarization is complete, the cell resets its membrane voltage back to the resting potential. The Na+ channels close, beginning the neuron's refractory period.