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- 1. Multiple ChoiceWhat is the normal resting potential of a neuron cell membrane?+40mV-30mV+55mV-70mV
- 2. Multiple ChoiceWhich ions are involved in an action potential?Na; ClNa; KK; ClNa; Ca
- 3. Multiple Choice
At which point on the diagram does depolarization of the axon occur?
ABCD - 4. Multiple ChoiceThe sodium potassium pump restores the resting potential. By which process does this work?OsmosisDiffusionFacilitated diffusionActive transport
- 5. Multiple ChoiceWhen a neuron is not engaged in an impulse.Resting potentialAction potentialNeural potentialSynaptic potential
- 6. Multiple ChoiceA membrane potential becoming less negative is calledhyperpolarizationdepolarizationrepolarizationpolarization
- 7. Multiple ChoiceIn resting potential, neurons have more _________ on the outside of the cell membrane.K+NaClNa+Cl-
- 8. Multiple Choice
What number(s) on the graph represents the THRESHOLD level of stimulus?
1 and 5
2
3
6
- 9. Multiple Choice
When a membrane potential reaches the peak positive charge, ________ channels open, ________ occurs, and ________ channels close.
Sodium, depolarization, potassiumPotassium, depoloarization, sodiumsodium, repolarization, potassiumpostassium, repolarization, sodium - 10. Multiple ChoiceWhy is -55 mV a significant number?This is the largest charge achieved during an action potential
This is the threshold required to activate an action potential
This is the resting charge of a neuronThis is the charge when all the sodium is inside the cell - 11. Multiple ChoiceAt what stage are both ions present in large concentrations INSIDE the neuron?DepolarizarionRepolarizationHyperpolarizationResting Potential
- 12. Multiple Choice
What number on the graph represents the refractory phase?
1234 - 13. Multiple Choice
When is the potassium channel open?
during rest only
during repolarization only
during depolarization only
all the time
- 14. Multiple Choice
Action potentials run along the ______ from ______ to ________.
axon, dendrites, axon terminals
axon, axon terminals, dendrites
dendrites, axon, axon terminals
axon terminals, axon, dendrites
- 15. Multiple ChoiceThe long, fiber like part of a neuron which the cell sends information to receiving neuronsaxondendriteaxon terminalgene
- 16. Multiple ChoiceThis insulating material forms a layer, around the axon of a neuron. It enables electrical signals to travel down the axon at higher speeds.neuronmyelin sheathdendriteneurotransmitter
- 17. Multiple Choice
Which is the following is represented by the letter B?
cell body
nucleus
dendrite
axon
- 18. Multiple ChoiceWhy does the sodium potassium pump require energy?It's moving molecules against their concentration gradientsIt's moving molecules with their concentration gradientIt doesn't
- Answer choicesTagsAnswer choicesTags