Read the following four statements that follow and choose the correct sequence in which they occur :
(1) Neuron has resting potential –70 mV maintained by sodium pump
(2) Neuronal membrane : lipid + protein has pre-existing polarization, allows limited passage
(3) Excitatory signal causes depolarization and action potential
(4) Neuron closes sodium and opens potassium channel regains resting potential
1
(1) → (2) → (3) → (4)
2
(2) → (1) → (3) → (4)
3
(3) → (2) → (1) → (4)
4
(1) → (3) → (2) → (4)