What are the Stages of nerve impulses?

Answer 1

The action potential has 5 main phases:
1) stimulation/rising phase - depolarization caused by influx of sodium ions at the axon hillock; potential increases from a resting potential of -70 mV2) peak phase - depolarization and membrane potential reaches a peak, with sodium channels open maximally, at about +40 mV

3) falling phase - potassium channels open in response, causing a subsequent reduction in membrane potential, and the neuron begins to repolarize

4) hyperpolarization/undershoot phase - more potassium channels stay open after sodium channels close, causing a hyperpolarization of the neuronal membrane, bringing the potential down below its initial resting potential (below -70 mV)

5) refractory phase - potassium channels begin to close, allowing the membrane potential to revert back to the resting potential of -70 mV; during this phase, the probability of the nerve being able to refire is extremely low, thus allowing for a delay between action potentials

Answer 2

The action potential has three different stages-depolarization, hperpolarization and repolarization.

• Depolarization is called the rising phase when positively charged sodium ions suddenly rush through open voltage-gated sodium channels into a neuron.
• Hyperpolarization is the phase where potassium channels and sodium channels reset.
• Repolarization is caused by the slow closing of sodium channels and the opening of voltage-gated potassium channels.

Answer 3

resting potential, action potential, repolarization, hyperpolarization, and refractory period.