The refractory period

Last updated: 04/04/2022

AQA A-Level Biology Nervous coordination The refractory period

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Question 1 of 25

1. Question
The axon will not respond to a new stimulus during a ______ ?
- Refractory period
- Depolarisation Period
- Hyperpolarisation Period
- Repolarisation Period
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Question 2 of 25

2. Question
To re-establish the original distribution, Na + and K + are returned to their _____ location by Na +/K + pumps in the cell membrane.
- Resting potential
- Action potential
- Membrane potential
- None of these
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Question 3 of 25

3. Question
Once _______ ions are completely returned to their resting potential location, the neuron is ready for another stimulus.
- Na + and K +
- Ca+
- Cl-
- K +
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Question 4 of 25

4. Question
The refractory period is necessary as it allows the proteins of voltage sensitive ion channels to…?
- restore their original polarity
- increase their polarity
- enhance the repolarisation
- minimise polarisation
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Question 5 of 25

5. Question
The refractory period lasts approximately______ ?
- 3 milliseconds
- 1 milliseconds
- 2 milliseconds
- 5 milliseconds
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Question 6 of 25

6. Question
The _____ is the brief interval after a successful stimulus when no second shock, however maximal, can elicit another response.
- absolute refractory period
- refractory period
- relative refractory period
- repolarisation period
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Question 7 of 25

7. Question
The absolute refractory period is when…?
- Na+ channels are open or recovering
- Na+ channels are closed or not recovering
- K+ channels are open
- Ca2+ channels are open or recovering
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Question 8 of 25

8. Question
The absolute refractory period corresponds to…?
- depolarisation and repolarisation
- hyperpolarisation
- both of these
- none of these
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Question 9 of 25

9. Question
If the membrane potential falls below the resting potential of –70mV it is said to be…?
- hyperpolarised
- depolarised
- repolarised
- polarised
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Question 10 of 25

10. Question
The potassium conductance eventually _______ and the cell returns to its resting membrane potential.
- drops
- rises
- rises and then drops
- none of these
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Question 11 of 25

11. Question
The return to the equilibrium resting potential marks the _______of the relative refractory period.
- end
- start
- interval
- none of these
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Question 12 of 25

12. Question
The relative refractory period occurs when the membrane is…?
- hyperpolarised
- depolarised
- both of these
- none of these
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Question 13 of 25

13. Question
In mammals, the absolute refractory period is roughly ____
- 1 millisecond
- 3 milliseconds
- 5 milliseconds
- 7 milliseconds
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Question 14 of 25

14. Question
Local anesthetics act by _____________ the ion channels.
- closing
- opening
- mutating
- inactivating
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Question 15 of 25

15. Question
A neuron fires when _____ ?
- a threshold potential is achieved
- apoptosis is induced
- re-stimulation occurs
- stimulation ceases
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Question 16 of 25

16. Question
On which of the following organisms was the research on nerve cells first carried out?
- Giant squid
- Octopus
- Drosophila melanogaster
- Grasshopper
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Question 17 of 25

17. Question
Which of the following has the highest permeability in a resting nerve cell?
- K+
- Na+
- Cl–
- I–
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Question 18 of 25

18. Question
Which of the following is NOT true about the absolute refractory period?
- In typical neurons, the absolute refractory period takes about 5 ms
- The molecular basis of the absolute refractory period is described by the ball-and-chain model
- Na+ channel inactivation is responsible for the absolute refractory period
- None of these are correct
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Question 19 of 25

19. Question
What is the main mechanism contributing to the absolute refractory period in neurons?
- the voltage-dependent sodium channels cannot be opened
- potassium ions can only flow outside the neurons
- autoreceptors are inhibiting the opening of ionotropic sodium channels
- the voltage-dependent potassium channels cannot be opened
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Question 20 of 25

20. Question
When can a neuron NOT produce an action potential?
- during the absolute refractory period
- when the voltage-dependent potassium channels are closed
- when there is an inhibitory postsynaptic potential
- all of these
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Question 21 of 25

21. Question
The higher the temperature, the______ the speed of conductance of a nerve impulse
- faster
- slower
- more moderate
- None of these
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Question 22 of 25

22. Question
The inactivation of Na+ channels and the delayed increase in K+ conductance are the underlying ionic conductance changes which can explain the ____.
- refractory period
- action period
- resting period
- none of these
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Question 23 of 25

23. Question
What does the speed at which a nerve impulse is transmitted depend on?
- All of these
- If the nerves are myelinated or unmyelinated
- The axon diameter
- The temperature
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Question 24 of 25

24. Question
How does myelination affect speed of conductance of a nerve impulse?
- It increases the speed at which it travels because of saltatory conduction
- It decreases the speed at which it travels
- Speed remains the same
- None of these
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Question 25 of 25

25. Question
The greater the axon diameter the _____ will the speed of conductance will be
- higher
- lower
- more moderate
- none of these
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