Stress and Anxiety. Dogs are sensitive animals; excessive stress or anxiety in their lives can cause hair loss. Sometimes hair loss is a bodily physical manifestation of stress, but other times anxious dogs will partake in compulsive licking that leads to hair loss in areas they lick too much. Dogs may get stressed or anxious due to a number of reasons, including confinement, bullying from other pets in the house, separation anxiety and past trauma or abuse.
Confidence votes 1.2K. Sodium. A positive ion (cation) that enters the cell (influx) rapidly when the membrane threshold is reached and the voltage gated sodium channels open. This occurs during the rising phase of an action potential, i.e. membrane depolarization beyond the threshold for activation.
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.