ANAT 5-4.1: Action Potentials

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

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

Tags

NGSS.HS-PS3-5

What number on the graph represents the Depolarization phase?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS3-5

What number on the graph represents the Hyperpolarization phase?

• 1
• 2
• 3
• 4

Match the following

• -70 mV

• Depolarization

• +30 mV

• Resting membrane potential

• -55 mV

• Threshold potential

What number on the graph represents the Depolarization phase?

• 1
• 2
• 3
• 4

Depolarization occurs because

• more potassium ions diffuse into the cell than sodium ions diffuse out of 
• more potassium ions diffuse out of the cell than sodium ions diffuse into it 
• more sodium ions diffuse into the cell than potassium ions diffuse out of it
• more sodium ions diffuse out of the cell than potassium ions diffuse into it

Tags

NGSS.HS-LS1-3

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

When a neuron is not engaged in an impulse.

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

Which ion is pumped into the axon of a neuron to help maintain the resting potential?

• calcium

• hydrogen

• potassium

• sodium

The charge on sodium and potassium ions

• both are negative

• Na is negative and K is positive

• both are positive

• Na is positive and K is negative