Action potential worksheet

Action potentials run along the ______ from ______ to ________.

• axon, dendrites, axon terminals

• axon, axon terminals, dendrites

• dendrites, axon, axon terminals

• axon terminals, axon, dendrites

Which ions are involved in an action potential?

• Na; Cl
• Na; K
• K; Cl
• Na; Ca

Which of the following is involved in maintaining the resting membrane potential of neurons?

• Na+/K+ ATPase pump moves 3Na+ in for every 2K+ out

• Na+/K+ ATPase pump moves 3K+ in for every 2Na+ out

• Na+/K+ ATPase pump moves 3Na+ out for every 2K+ in

• Na+/K+ ATPase pump moves 3K+ out for every 2Na+ in

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

• +40mV
• -30mV
• +55mV
• -70mV

At resting membrane potential, neurons have more​ (a)   on the outside of the cell membrane.

• Na+
• K+
• NaCl
• Cl-

At resting membrane potential, neurons have more​ (a)   on the inside of the cell membrane.

• K+
• NaCl
• Na+
• Cl-

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

• A
• B
• C
• D

Which number on the graph represents the threshold potential?

• 1

• 2

• 3

• 4

• 6

When the membrane potential reaches +40mV, ________ channels open, ________ occurs, and ________ channels close.

• sodium, depolarization, potassium

• potassium, depoloarization, sodium

• sodium, repolarization, potassium

• postassium, repolarization, sodium

Why is -55 mV a significant number?

• This is the largest charge achieved during an action potential

• This is the threshold required to initiate an action potential

• This is the resting charge of a neuron

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