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Biology
12th
grade
Resting potential, action potential and synapses
30 questions
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- 1. Multiple ChoiceWhich ions are involved in an action potential?Na; ClNa; KK; ClNa; Ca
- 2. Multiple ChoiceWhat is the normal resting potential of a neuron cell membrane?+40mV-30mV+55mV-70mV
- 3. Multiple ChoiceWhich is the correct order of events in depolarisation then repolarisation?Sodium channels close, potassium channels openSodium channels open, potassium channels open,Sodium channels open, potassium channels closePotassium channels open, sodium channels open
- 4. Multiple ChoiceAt which point on the diagram does depolarisation of the axon occur?ABCD
- 5. Multiple ChoiceThe sodium potassium pump restores the resting potential. By which process does this work?OsmosisDiffusionFacilitated diffusionActive transport
- 6. Multiple ChoiceWhat is the insulating membrane that surrounds parts of the axon that helps to protect & propagate action potential?AxonDendritesNode of RanvierMyelin Sheath
- 7. Multiple ChoiceWhen a neuron is not engaged in an impulse.Resting potentialAction potentialNeural potentialSynaptic potential
- 8. Multiple ChoiceWhen a neuron is resting, the inside of the axon has a ____________ charge.positivenegative
- 9. Multiple ChoiceA membrane potential becoming less negative is calledhyperpolarizationdepolarizationrepolarizationpolarization
- 10. Multiple ChoiceIn resting potential, neurons have more _________ on the outside of the cell membrane.K+NaClNa+Cl-
- 11. Multiple ChoiceIn resting potential, neurons have more ____________ on the inside of the cell membrane.NaClNa+K+Cl-
- 12. Multiple ChoiceDescribes the fact that a neuron fires at the same intensity despite the intensity of the stimulus.ThresholdRepolarizationAll or None PrincipleAction Potential
- 13. Multiple Choice
What number(s) on the graph represents the THRESHOLD level of stimulus?
1 and 5
2
3
6
- 14. Multiple ChoicePart of a neuron that receives information from other neuronsaxondendritesmyelin sheathsynapse
- 15. Multiple Choicea junction at which a neuron meets another cellaxondendritesmyelin sheathsynapse
- 16. Multiple ChoiceWhat number(s) on the graph represents the Resting Potential?1 and 21 and 52 and 33 and 4
- 17. Multiple ChoiceWhen a neuron is depolarized, what are the first channels to open?SodiumPotassiumCalciumACTH
- 18. Multiple ChoiceWhen a neuron is resting, the inside of the axon has a ____________ charge.-55 mV-70 mV40 mV-75 mV
- 19. Multiple ChoiceWhen a neuron is not engaged in an impulse.Resting potentialAction potentialNeural potentialSynaptic potential
- 20. Multiple ChoiceWhich ions are involved in the electrical nerve impulse?Iodine and SodiumPotassium and SodiumIron and SodiumCalcium and Iodine
- 21. Multiple ChoiceWhat number on the graph represents the Depolarization phase?1234
- 22. 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
- 23. Multiple ChoiceAt what stage are both ions present in large concentrations INSIDE the neuron?DepolarizarionRepolarizationHyperpolarizationResting Potential
- 24. Multiple Choice
Which of the following uses ACTIVE transport?
sodium-potassium pump
sodium channel
potassium channel
diffusion
- 25. Multiple ChoiceWhen a membrane potential reaches +30mV, ________ channels open, ________ occurs, and ________ channels close.Sodium, depolarization, potassiumPotassium, depoloarization, sodiumsodium, repolarization, potassiumpostassium, repolarization, sodium
- 26. Multiple Choicea signal molecule that transmits nerve impulses across synapsesneuronneurotransmitternerveaction potential
- 27. Multiple ChoiceWhat is a characteristic of axons?When there is resting potential, the outside of the axon is negative relative to the inside.During an action potential, sodium ions diffuse into the axon.The axon is depolarized when potassium ions diffuses out of it.Depolarization occurs when potassium ions diffuses into the axon.
- 28. Multiple ChoiceDepolarization occurs becausemore potassium ions diffuse into the cell than sodium ions diffuse out ofmore potassium ions diffuse out of the cell than sodium ions diffuse into itmore sodium ions diffuse into the cell than potassium ions diffuse out of itmore sodium ions diffuse out of the cell than potassium ions diffuse into it
- 29. Multiple ChoiceThe sodium-potassium pump is involved in establishing the resting membrane potential.TrueFalse
- 30. Multiple Choice
The operation of the sodium-potassium "pump" moves:
sodium & potassium ions into the cell
sodium & potassium ions out of the cell
sodium ions out of the cell & potassium ions into the cell
sodium ions into the cell & potassium ions out of the cell
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