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- 1. Multiple ChoiceWhat is the insulating membrane that surrounds parts of the axon that helps to protect & propagate action potential?AxonDendritesNode of RanvierMyelin Sheath
- 2. Multiple Choice
When a neuron is at REST,
the inside of the neuron is negatively charged compared to the outside.
the inside of the neuron is positively charged compared to the outside.
there is no charge difference established
none of these is true
- 3. Multiple Choicepart of a neuron that receives information from other neuronsaxondendritesmyelin sheathsynapse
- 4. Multiple Choicea signal molecule that transmits nerve impulses across synapsesneuronneurotransmitternerveaction potential
- 5. Multiple ChoiceWhen a neuron is depolarized, what are the first channels to open?SodiumPotassiumCalciumACTH
- 6. Multiple ChoiceWhen a neuron is resting, the inside of the axon has a ____________ charge.positivenegative
- 7. Multiple Choice
Which ions are involved in the electrical nerve impulse?Iodine and SodiumPotassium and SodiumIron and SodiumCalcium and Iodine - 8. Multiple Choice
Depolarization occurs when
sodium channels open
potassium channels open
sodium channels close
potassium channels close
- 9. Multiple ChoiceZDendriteAxon TerminalNeurotransmittersSynapse
- 10. Multiple Choice
when does the stimuli cause an action potential?
when it reaches threshold
just below the threshold
just above threshold
- 11. Multiple Choice
Which is true for repolarisation?
sodium channels open, potassium channels close
sodium channels open, potassium channels open
sodium channels close, potassium channels open
sodium channels close, potassium channels close
- 12. Multiple ChoiceWhat number(s) on the graph represents the Resting Potential?1 and 21 and 52 and 33 and 4
- 13. Multiple ChoiceA membrane potential becoming less negative is calledhyperpolarizationdepolarizationrepolarizationpolarization
- 14. Multiple ChoiceWhat number on the graph represents the Depolarization phase?1234
- 15. Multiple ChoiceWhat number on the graph represents the Hyperpolarization phase?1234
- 16. 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
- 17. Multiple Choice
The resting membrane potential is:
+40mV
-70mV
-20mV
0 mV
- 18. Multiple Choice
The sodium potassium pump...
is energy (ATP) free as sodium and potassium move in and out by diffusion as needed
moves 3 sodium ions into the neuron and 3 potassium out only if ATP is present
moves 3 sodium in to the neuron and 2 potassium without energy from ATP
moves 3 sodium out of the neuron and 2 potassium into the neuron only if there is energy from ATP
- 19. Multiple Choice
What number(s) on the graph represents the THRESHOLD level of stimulus?
1 and 5
2
3
6
- 20. Multiple Choice
What structure is labeled B
Dendrite
Axon
Axon Terminal
Cell Body
- Answer choicesTagsAnswer choicesTags