Action Potential

What is the normal resting potential of a neuron cell membrane?

• +40mV
• -30mV
• +55mV
• -70mV

Which is the correct order of events in depolarisation then repolarisation? 

• Sodium channels close, potassium channels open
• Sodium channels open, potassium channels open, 
• Sodium channels open, potassium channels close
• Potassium channels open, sodium channels open

At which point on the diagram does depolarisation of the axon occur? 

• A
• B
• C
• D

What is the insulating membrane that surrounds parts of the axon that helps to protect & propagate action potential?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath

A membrane potential becoming less negative is called

• hyperpolarization
• depolarization
• repolarization
• polarization

Describes the fact that a neuron fires at the same intensity despite the intensity of the stimulus.

• Threshold
• Repolarization
• All or None Principle
• Action Potential

What number(s) on the graph represents the THRESHOLD level of stimulus?

• 1 and 5

• 2

• 3

• 6

The part of the neuron that is protected by the myelin sheath is the

• cell body

• dendrites

• axon

• axon terminals

When a neuron is at REST,

• the inside of the neuron is negatively charged compared to the outside.

• the inside of the neuron is positively charged compared to the outside.

• there is no charge difference established

• none of these is true

Depolarization occurs when

• sodium channels open

• potassium channels open

• sodium channels close

• potassium channels close