Welcome to the Quiz!
This quiz contains 11 questions from a mix of 1 subtopics.
What is the typical resting potential of a neurone?
+30 mV
-70 mV
-30 mV
+70 mV
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Which ion has a higher concentration outside of a neurone at rest?
calcium
chloride
potassium
sodium
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What is the term for the potential that must be reached to generate an action potential?
repolarisation potential
depolarisation potential
resting potential
threshold potential
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Which ion flows into the neurone during depolarisation?
sodium
potassium
chloride
calcium
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When does repolarisation begin during generation of an action potential?
at around -70 mV
at around +70 mV
at around +30 mV
at around -55 mV
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Which ion flows out of the neurone during repolarisation?
sodium
chloride
calcium
potassium
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Which of the following best describes the all-or-nothing principle of action potentials?
an action potential occurs fully and uniformly once threshold is reached
a stronger stimulus causes a larger action potential
multiple action potentials can be generated simultaneously
the threshold potential adjusts based on stimulus strength
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What happens if the threshold potential is not reached?
a full action potential occurs
frequency of action potentials increases
no action potential occurs
a partial response occurs
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Which aspect of an action potential increases with a stronger stimulus?
frequency of action potentials
duration of refractory period
size of action potential
speed of conduction
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The generation of an action potential is an example of a feedback mechanism, as the influx of sodium causes further depolarisation, which opens more sodium channels.
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Describe the stages involved in generating an action potential.
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