Negative electrical signal cause signals to move like a wave in the cells i.e., nerve cells thus the first statement is correct.
Nerve cells create an assortment of electrical signals to transmit and store data. As a rule, they deliver a negative potential: resting state potential (-40 to -90 mV). An activity potential transitorily nullifies the negative resting potential making the transmembrane positive.
Two mechanisms have advanced to transmit nerve signals. First, for communication between cells, the electrical signals by and large are changed over into chemical signals passed on by little flag-bearer atoms called neurotransmitters.
Second, inside cells, electrical signals are passed on along the cell layer.
Moment, for communication between cells, the electrical signals for the most part are changed over into chemical signals passed on by little courier particles called neurotransmitters.
The electrical signal transmission inside neurons is based on voltage contrasts (i.e., possibilities) that exist between the interior and the exterior of the cell.
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