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.
Depolarization occurs when the inside of the cell becomes more positive and the membrane potential moves toward threshold. If depolarization is sufficient, threshold is reached and the cell will undergo an action potential. Hyper polarization is the opposite - the inside of the cell becomes more negative and the membrane potential moves away from the threshold; the cell is therefore less likely to undergo an action potential.