=One of the above stimuli will trigger a change in the membrane of a neuron. OR simply stimulation of a neuron.
1. A resting neuron is said to be POLARIZED. In this resting state there
is more sodium, Na, outside the cell than inside, and there is more potassium, K, inside than outside.
2. Then, the neuron encounters one or more of the 5 stimuli listed above!
3. The neuron is then said to be active and DEPOLARIZED. In this active state, sodium is actively pumped in and potassium is actively pumped out. Actively meaning that this takes ATP! So now there is more potassium on the outside of the cell membrane and more sodium on the inside of the cell membrane.