What is the main charge of a cell at resting potential in terms of millivolts?

The main charge of a cell at resting potential is approximately -70mV. This negative value indicates that the interior of the cell is negatively charged relative to the outside. At resting potential, a neuron is polarized, primarily due to the distribution of ions across the cell membrane, with higher concentrations of potassium ions inside and sodium ions outside.

This resting potential is crucial for the functioning of neurons, as it sets the stage for action potentials, which are necessary for the transmission of nerve impulses. The negative charge is maintained by the sodium-potassium pump, which actively transports ions to sustain this potential. Thus, -70mV is the correct value that represents the typical resting membrane potential in neurons, allowing them to respond to stimuli and propagate signals effectively.