Nervous System Action Potential

Part of a motor neuron that receives information from other neurons

• axon

• dendrites

• myelin sheath

• synapse

Which numbers on the graph represents the Resting Potential?

• 1 and 2

• 1 and 5

• 2 and 3

• 3 and 4

When a neuron csm becomes depolarised, what are the first channels to open in response to a stimulus?

• Sodium

• Potassium

• Calcium

When a neuron is resting, the inside of the axon has a ____________ charge.

• positive
• negative

-70 mV is the measure of a

• Threshold Potential
• Action Potential
• Resting Potential
• End Point Potential

Depolarisation begins when ________ channels open, then _________ channels open and ____________ occurs.

• Sodium, depolarization, potassium

• Potassium, depolarisation, sodium

• sodium, potassium, repolarisation

• postassium, repolarisation, sodium

What number on the graph represents the Depolarization phase?

• 1
• 2
• 3
• 4

What number on the graph represents the Hyperpolarization phase?

• 1
• 2
• 3
• 4

Describes the fact that action potential has the same amplitude despite the intensity of the stimulus.

• Threshold

• Repolarization

• All or Nothing Principle

• Action Potential

Why is -55 mV a significant number?

• This is the largest voltage achieved during an action potential

• This is the threshold required to initiate an action potential

• This is the resting voltage of a neuron

• This is the voltage when all the sodium is inside the cell