Theoretically, a recognized member of the modern state system possessing formal sovereignty and occupied by a people who see themselves as a single, united nation. Most nations and states aspire to parlance, nation-state is used as a synonym for country or state.
In biology, depolarization is a decrease in the absolute value of a cell's membrane potential. Thus, changes in membrane voltage in which the membrane potential becomes less positive or less negative are both depolarizations.
1. Gated ion channels are triggered by some stimulus to open. The appropriate stimulus opens chemical, mechanical, or light gated ion channels. 2. A small area of the membrane is hyperpolarized or depolarized.