Question

Action potentials occur in the axon, but not in the dendrites or cell body of a neuron because… (Think about what is necessary for an action potential to occur…)

Select one:

A. The concentrations of Na+ and K+ are different in the cytoplasm of the axon than in the cell body.

B. There are too many voltage-gated Na+ channels in the dendrites and cell body.

C. Voltage-gated Na+ channels are found in the axon, but not in the cell body or dendrites.

D. The axon is myelinated, but the dendrites and cell body are not myelinated.

E. Ligand-gated channels are found in the axon, but not in the cell body or dendrites.

Answer 1

When a stimulus of required threshold richest to the axon the action potential generates. Action potential is the electrical activity which propagates through the nerve fibres. It arises in axon due to the polarization of the membrane. Exxon contains voltage-gated sodium channels. This gate is very important in action potential generation. The voltage gated channel opens due to the change in permeability of the membrane. inside the membrane sodium Ion concentration is less than potassium ion concentration and outside the membrane sodium Ion concentration is more than potassium ion. Rapid influx of sodium Ion takes place from the membrane and also potassium ion goes outside when the membrane's voltage gated channels open. This lead the generation of action potential. So, correct response (C)