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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 depolarisation 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 ChoiceWhen a membrane potential reaches +30mV, ________ 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 potentialThis is the threshold required to complete an action potentialThis is the resting charge of a neuronThis is the charge when all the sodium is inside the cell
- 11. Multiple ChoiceThe sodium-potassium pump....Sends (Na+) into the cellSends (K+) into the cellExchanges (K+) & (Na+) during depolarizationExchanges (K+) & (Na+) during hyperpolarization
- 12. Multiple ChoiceAt what stage are both ions present in large concentrations INSIDE the neuron?DepolarizarionRepolarizationHyperpolarizationResting Potential
- 13. Multiple ChoiceWhat number on the graph represents the Hyperpolarization phase?1234
- 14. Multiple Choice
When is the potassium channel open?
during rest only
during repolarization only
during depolarization only
all the time
- 15. 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
- 16. Multiple Choice
An action potential is __________ in nature, with the inside of the neuron being more ________.
chemical, negative
electrical, negative
chemical, positive
electrical, positive
- 17. Multiple Choice
As the neuron fires, there's a reversal in _____ as the axon undergoes ________.
direction, depolarization
charge, depolarization
direction, repolarization
charge, repolarization
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