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
Action potentials are considered an all-or nothing event. Once the threshold potential is reached, the neuron completely depolarizes. As soon as depolarization is complete, the cell resets its membrane voltage back to the resting potential. The Na+ channels close, beginning the neuron's refractory period.