Neuron Action Potentials

Part of a neuron that receives information from other neurons

• axon
• dendrites
• myelin sheath
• synapse

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

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

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

• -55 mV
• -70 mV
• 40 mV
• -75 mV

When a neuron is not engaged in an impulse.

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

Which ions are involved in the electrical nerve impulse?

• Iodine and Sodium
• Potassium and Sodium
• Iron and Sodium
• Calcium and Iodine

Tags

NGSS.HS-PS1-3

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

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

• calcium

• hydrogen

• potassium

• sodium

Why is the speed of an impulse increased if a neuron is wrapped in myelin?

• potassium ions flow out of the neurone faster

• myelin insulates the neurone so the temperature increases

• the impulse can jump from node to node

• it allows neurones to touch each other

What number on the graph represents the Threshold phase

• 1
• 3
• 4
• 6

Which of the following restores the resting membrane potential in a neurone?

I. Na+ channels opening

II. K+ channels closing

III. The Na+/K+ ATP pump

• I and II only

• II and III only

• I and III only

• III only