Unit 3: Interaction and Interdependence
Topic 3.5: Neural Signalling Questions
Practice 20 exam-style questions for IB Biology Topic 3.5. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State1 mark
State where depolarization occurs along a myelinated axon during an action potential.
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Which sensory receptor type detects the temperature of a hot drink touching the lips?
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In a pain reflex arc, identify the receptor and the effector, and state where the synapses between the neurons are located.
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What is the approximate value of the resting potential of a neuron, and is the inside positive or negative relative to the outside?
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State the two components of the central nervous system.
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Which two structures make up the central nervous system?
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In which region does chemical transmission of a signal between two neurons most likely occur?
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Which statement correctly describes the function of a sensory neuron?
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State the directions in which sodium ions and potassium ions are moved by the sodium-potassium pump as it establishes the resting potential.
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State where the synapses between the sensory neuron and the relay neuron of a reflex arc are located.
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2026
Calculate the total synaptic delay in the reflex arc.
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Which ion enters the presynaptic neuron and triggers synaptic vesicles to fuse with the membrane?
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A weak stimulus is applied to a neuron but no action potential is recorded.
Which term best explains why nothing fired?
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Which ion movements by the sodium-potassium pump establish the resting potential of a neuron?
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What is the approximate resting potential of a neuron, and is the inside of the axon positive or negative?
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On a diagram of a myelinated motor neuron, where does depolarization occur during an action potential?
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State the name of the structure at which a chemical signal is passed from one neuron to the next.
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State which ion moves into the axon during depolarisation, and the direction in which it moves.
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2026
Draw a graph of membrane potential against time during an action potential.
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In a pain (withdrawal) reflex arc, which structure acts as the receptor?
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