Syllabus Edition

First teaching 2023

First exams 2025

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Neural Signalling (SL IB Biology)

Exam Questions

1 hour19 questions
1
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Between which structures do sensory neurones transmit electrical impulses?

  • From effectors to the central nervous system (CNS).

  • From effectors to receptors.

  • From receptors to effectors.

  • From receptors to the central nervous system (CNS).

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2
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Where would myelin be found?BvBrUXey_e-2

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    3
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    Neurotransmitters leave the presynaptic neurone and enter the synaptic cleft. After this, they travel across the cleft to a receptor on the postsynaptic neurone membrane.

    Identify the processes that are required for this to occur.

      Neurotransmitters enter synaptic cleft Neurotransmitters travel across cleft
    A. Endocytosis Diffusion
    B. Endocytosis Active transport
    C. Exocytosis Diffusion
    D. Exocytosis Active transport

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      The diagram below shows a sensory neurone connected to its associated receptor cells.

      zVkh1w6k_3

       Which best describes the function of the structure labelled A?

      • Contains most cellular structures

      • Acts as an electrical insulator

      • Transmit impulses to the spinal cord

      • Transmit and recieve impulses to other neurones

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      2
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      The diagram below shows a sodium-potassium pump within the axon membrane of a neurone.

      nDcY0Z0__4

      What is the role of active transport in the transmission of nerve impulses by neurones?

      • Establishes the resting potential needed for impulse transmission by pumping sodium ions out of the axon and potassium ions into the axon.

      • Depolarisation of the axon by moving sodium ions across the membrane into neurone.

      • Establishes the resting potential needed for impulse transmission by moving sodium ions into the axon and potassium ions out of the axon.

      • Initiates the action potential needed for the transmission of an impulse by pumping calcium ions into the axon.

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      3
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      Which line of the table represents a neurone at its resting potential?

        Concentration of ions inside neurone Cell surface membrane permeability to Na⁺ Level of activity of Na⁺/K⁺ pump
      Sodium (Na⁺) Potassium (K⁺)
      A high low high active
      B high low low inactive
      C low high high inactive
      D low high low active

       

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        4
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        Membrane channel proteins are essential for the normal functioning of nerves.

        Which process in nerves does not require a membrane protein?

        • Active transport of sodium.

        • Depolarisation during an action potential.

        • Binding of neurotransmitters.

        • Diffusion of neurotransmitters.

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        Study the diagram below.X3IhGrSh_h-5

        Which of the following table rows correctly identifies I - VI?

          I II III IV V VI
        A. Acetylcholine Acetyl-cholinesterase Cholinergic receptor Choline Acetyl group Acetyl-CoA
        B. Acetyl-cholinesterase Acetyl-CoA Acetylcholine Cholinergic receptor Choline Acetyl group
        C. Acetylcholine Cholinergic receptor Acetyl-cholinesterase Acetyl group Choline Acetyl-CoA
        D. Acetylcholine Cholinergic receptor Acetyl-CoA Choline Acetyl group Acetyl-cholinesterase

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