Lesson 8.1.2
8.1.2 Action potentials and saltatory conduction Quiz: Pearson Edexcel Biology, Unit 8
20 questions
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Lesson 8.1.2, Action potentials and saltatory conduction: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 8: Grey Matter, written with Revision Ninja.
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The 20 questions
-
What is the typical resting membrane potential of a human neurone?
- 0 mV
- +40 mV
- -55 mV
- -70 mV
-
Which ion movement causes depolarisation during an action potential?
- Potassium efflux
- Sodium influx
- Sodium efflux
- Potassium influx
-
Which ion movement causes repolarisation of an axon membrane?
- Potassium influx
- Sodium influx
- Potassium efflux
- Sodium efflux
-
According to the all-or-nothing principle, what increases when stimulus strength rises above threshold?
- Action potential speed
- Action potential frequency
- Action potential duration
- Action potential amplitude
-
What is a main function of the refractory period in neurones?
- Unidirectional impulse travel
- Increased impulse amplitude
- Continuous depolarisation
- Accelerated ATP synthesis
-
Why can an action potential not travel backwards during the refractory period?
- Inactivated sodium channels
- Closed potassium channels
- Blocked myelin sheaths
- Depleted ATP supply
-
Where does depolarisation occur during saltatory conduction on a myelinated axon?
- Synaptic clefts
- Nodes of Ranvier
- Schwann cell cytoplasm
- Myelin sheaths
-
What is a major advantage of saltatory conduction compared to continuous conduction?
- Faster impulse speed
- Larger action potentials
- Greater neurotransmitter release
- Lower resting potential
-
An axon conducts at 100 m/s when myelinated and 1 m/s unmyelinated. How many times faster is it?
- 1000 times
- 50 times
- 100 times
- 10 times
-
Which active transport mechanism restores original ion concentrations after action potentials pass?
- Voltage-gated potassium channel
- Sodium-potassium pump
- Voltage-gated sodium channel
- Calcium ion pump
-
What causes repolarisation to begin during an action potential?
- Calcium channels opening
- Sodium channels closing
- Potassium channels closing
- Sodium channels opening
-
What happens when a neurone receives a subthreshold stimulus?
- Smaller action potential
- Continuous action potential
- Slower action potential
- No action potential
-
By what mechanism does a myelin sheath speed up impulse conduction?
- Synaptic summation
- Saltatory conduction
- Active transport
- Continuous conduction
-
Which change reduces the conduction speed of an action potential?
- Greater threshold
- Increased axon diameter
- Loss of myelin
- Higher temperature
-
How does increasing axon diameter affect nerve impulse conduction speed?
- Speed stops completely
- Speed increases
- Speed decreases
- Speed remains constant
-
What triggers voltage-gated sodium channels to open in a neurone?
- Membrane hyperpolarisation
- Neurotransmitter binding
- Membrane depolarisation
- ATP hydrolysis
-
Where does ion exchange occur along a myelinated axon?
- Inside Schwann cells
- Across entire axon
- At synaptic knobs
- Nodes of Ranvier
-
What directly triggers depolarisation at the next node of Ranvier?
- Active transport pumps
- Local ionic currents
- Neurotransmitter diffusion
- Potassium influx
-
Which factor determines the conduction speed of an action potential?
- Frequency of impulses
- Stimulus strength
- Action potential amplitude
- Axon diameter
-
A myelinated axon is 500 mm long with nodes spaced 1 mm apart. How many nodes are present?
- 1000
- 250
- 50
- 500
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