Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
Which of the following best describes the role of the refractory period?
it causes a wave of depolarisation
it speeds up the transmission of nerve impulses
it allows action potentials to overlap
it prevents the backward flow of nerve impulses
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What is the process by which action potentials 'jump' between nodes of Ranvier called?
continuous conduction
saltatory conduction
lateral spread
wave propagation
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Which of the following statements is true of myelinated neurones compared to unmyelinated neurones?
myelinated neurones transmit impulses more slowly
myelinated neurones undergo continuous depolarisation
myelinated neurones have a thinner axon diameter
myelinated neurones transmit impulses faster
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How does temperature affect the speed of impulse transmission?
temperature has no effect on the speed of transmission
temperatures above 40°C cause faster transmission
lower temperatures result in faster transmission
higher temperatures accelerate ion diffusion leading to faster transmission
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Which type of neurone would likely transmit an action potential fastest?
an unmyelinated neurone with a small diameter
an unmyelinated neurone with a large diameter
a myelinated neurone with a small diameter
a myelinated neurone with a large diameter
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How does a larger axon diameter increase the speed of impulse transmission?
by enabling a greater degree of myelination
by increasing the number of sodium channels
by causing a longer absolute refractory period
by decreasing resistance to ion flow
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How does saltatory conduction enable faster transmission of nerve impulses?
by preventing the backward flow of impulses
by enabling 'jumping' between nodes of Ranvier
by allowing action potentials to overlap
by continuous depolarisation along the axon
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Which of the following factors does NOT affect the speed of transmission of an action potential?
axon length
temperature
axon diameter
myelination
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During the period after firing an action potential, a neurone's membrane can't generate another action potential because sodium ion channels remain closed.
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Describe how two different factors affect the speed of transmission of an action potential.
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