U4L2 Action Potential Graphs

An electrical impulse within a single neuron is called a

• synapse

• membrane potential

• action potential

• cell body

Depolarization is occuring at number

• 1

• 2

• 4

• 5

What number(s) on the graph represents the Resting Potential?

• 1 and 2
• 1 and 5
• 2 and 3
• 3 and 4

When a membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.

• Sodium, depolarization, potassium
• Potassium, depoloarization, sodium
• sodium, repolarization, potassium
• postassium, repolarization, sodium

What number on the graph represents the Hyperpolarization phase?

• 1
• 2
• 3
• 4

Why is -55 mV a significant number?

• This is the largest charge achieved during an action potential
• This is the threshold required to complete an action potential
• This is the resting charge of a neuron
• This is the charge when all the sodium is inside the cell

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

• +40mV
• -30mV
• +55mV
• -70mV

Which ions are involved in an action potential?

• Na; Cl
• Na; K
• K; Cl
• Na; Ca

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

• A
• B
• C
• D

When a neuron is not engaged in an impulse.

• Resting potential
• Action potential
• Neural potential
• Synaptic potential