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 speeds up the transmission of nerve impulses
it allows action potentials to overlap
it prevents the backward flow of nerve impulses
it causes a wave of depolarisation
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What is the process by which action potentials 'jump' between nodes of Ranvier called?
continuous conduction
lateral spread
wave propagation
saltatory conduction
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Which of the following statements is true of myelinated neurones compared to unmyelinated neurones?
myelinated neurones undergo continuous depolarisation
myelinated neurones have a thinner axon diameter
myelinated neurones transmit impulses faster
myelinated neurones transmit impulses more slowly
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How does temperature affect the speed of impulse transmission?
higher temperatures accelerate ion diffusion leading to faster transmission
temperature has no effect on the speed of transmission
temperatures above 40°C cause faster transmission
lower temperatures result in faster transmission
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Which type of neurone would likely transmit an action potential fastest?
a myelinated neurone with a small diameter
a myelinated neurone with a large diameter
an unmyelinated neurone with a small diameter
an unmyelinated neurone with a large diameter
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How does a larger axon diameter increase the speed of impulse transmission?
by decreasing resistance to ion flow
by causing a longer absolute refractory period
by increasing the number of sodium channels
by enabling a greater degree of myelination
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How does saltatory conduction enable faster transmission of nerve impulses?
by enabling 'jumping' between nodes of Ranvier
by continuous depolarisation along the axon
by allowing action potentials to overlap
by preventing the backward flow of impulses
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Which of the following factors does NOT affect the speed of transmission of an action potential?
axon diameter
axon length
temperature
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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