We know that the sum of the measures of any triangle is 180 degrees. Using the fact that angle A + angle B + angle C = 180 degrees, we can find the measure of angle C. angle A = 40. angle B = 60. angle C = we don't know.
When a depolarization wave reaches the synaptic end bulb of a presynaptic neuron, the NEXT event is diffusion of calcium ions into the cell A neurotransmitter that allows sodium ions to leak into a postsynaptic neuron causes
1 Action Potential: sudden reversal of voltage along neuron membrane to cause depolarization (-70mV â +40mV). 2  Graded potentials: incoming stimulation not strong enough to complete depolarize a cell. 3  All-or-none law: neurons must fire at max intensities or not at all.