Understanding Action Potentials
Interactive Video
•
Science
•
10th - 12th Grade
•
Practice Problem
•
Easy
Standards-aligned
S. McMillan
Used 7+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What initiates an action potential in a neuron?
The movement of potassium ions out of the cell
The release of neurotransmitters binding to receptors
The closing of voltage-gated sodium channels
The hyperpolarization phase
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the resting membrane potential of a neuron?
-55 millivolts
-70 millivolts
+30 millivolts
0 millivolts
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role do neurotransmitters play in generating an action potential?
They close potassium channels
They open sodium-potassium pumps
They bind to receptors, allowing sodium ions to enter the neuron
They hyperpolarize the neuron
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which ions primarily move into the neuron during depolarization?
Chloride
Magnesium
Potassium
Sodium
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
At what voltage do voltage-gated sodium channels open?
0 millivolts
-55 millivolts
-70 millivolts
+30 millivolts
Tags
NGSS.HS-PS3-5
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the significance of the -55 millivolts threshold in neurons?
It indicates the neuron is in the repolarization phase
It signals the neuron to hyperpolarize
It triggers the opening of voltage-gated sodium channels
It is the resting membrane potential
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens when the neuron's interior reaches +30 millivolts?
Sodium channels close and potassium channels open
Potassium channels close
Sodium channels open further
Neuron immediately returns to resting potential
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