Which of the following is a passive force that acts to encourage na+ ions to enter resting neurons? both 'random motion, which tends to move ions down their concentration gradients' and 'electrostatic pressure, which forces ions down their electrostatic gradients both 'random motion, which tends to move ions down their concentration gradients' and 'sodium-potassium pumps, which distribute na+ and k+ ions equally ' electrostatic pressure, which forces ions down their electrostatic gradients sodium-potassium pumps, which distribute na+ and k+ ions equally random motion, which tends to move ions down their concentration gradients