Which of the following statements are incorrect for neuron?

(i) Neurons are excitable cells because their membranes are in a polarized state.

(ii) Different types of ion channels are present on the neural membrane.

(iii) Ion channels are selectively permeable to different membrane.

(iv) When a neuron is not conducting any impulse the axonal membrane is comparatively less permeable to K + and nearly impermeable to Na + .

(v) Resting membrane is impermeable to negatively charged proteins present in the axoplasm.

(vi) The ionic potential across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump.

(vii) In sodium-potassium pump 2 Na + transported outwards and 3 K + into the cell.