Action Potential Practice and Problems

This graphic shows the concentration of ions when a nerve is at rest. Is there more sodium or potassium outside the cell membrane?

• sodium

• potassium

• both

This graphic shows the concentration of ions when a nerve is at rest. Is there more sodium or potassium inside the cell membrane?

• sodium

• potassium

• both

This graphic shows the concentration of ions during depolarization. Which ion is moving inside the neuron: sodium or potassium?

• sodium

• potassium

• both

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

When this ion moves to the inside of the neuron, the inside becomes more positive or more negative?

• positive

• negative

• neutral

Tags

NGSS.HS-PS3-5

Which gate opens to allow this ion to move to the inside of the neuron, m gate (Na+) or n gate (K+)?

• m gate (Na+)

• n gate (K+)

• h gate (Na+ inactivation)

Tags

NGSS.HS-LS1-3

This graphic shows the concentration of ions during repolarization. Which ion is moving outside the neuron: sodium or potassium?

• sodium

• potassium

• both

When this ion moves to the outside of the neuron, the inside becomes more positive or more negative?

• positive

• negative

• neutral

Which gate opens to allow this ion to move to the outside of the neuron, m gate (Na+) or n gate (K+)?

• m gate (Na+)

• n gate (K+)

• h gate (Na+ inactivation)

Put the steps of an action potential in the correct order.

• Neuron is at rest

• Depolarization occurs: inside becomes +

• K+ gates open and K+ moves out

• Repolarization occurs: inside becomes -

• Na+ gates open and Na+ moves in

This graph is showing a normal action potential. The dotted lines show what could happen if there isn't a normal action potential. Why would C happen?

• During depolarization, the Na+ gate didn't open while the K+ did open.

• During depolarization, the K+ gate didn't open while the Na+ gate did open.

• During repolarization, the K+ gate did open while the Na+ gate closed.

• During repolarization, the K+ gate didn't open and the Na+ gate stayed open.