Factors determining nerve conduction speed

Biologia IBPaper 1B, maj 2026, TZ1wzorowane3 pktotwarteśrednie (szac.)

Zadanie 3a

(i) Identify the type of scale used on both axes. (ii) Suggest why these scales are useful here. (iii) Identify the overall relationship between diameter and conduction speed.

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Biologia IBPaper 1B, maj 2026, TZ1wzorowane1 pktotwarteśrednie (szac.)

Zadanie 3b

Outline the structural feature that lets a mammalian axon conduct at a speed comparable with a much wider squid axon.

• Materiał graficzny

Biologia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 11

The schematic cross-section shows axons surrounded by concentric membrane layers. What function is associated with structure X? A. It provides insulation that permits faster impulse conduction along the axon B. It synthesizes neurotransmitter receptors in…

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Biologia IBPaper 1B, maj 2025, TZ1wzorowane3 pktotwarteśrednie (szac.)

Zadanie 3a

(i) Describe the relationship shown. (ii) In a separate similar dataset, a fitted model gives R² = 0.89. Comment on this result.

• Materiał graficzny

Biologia IBPaper 2, maj 2025, TZ1wzorowane1 pktotwarteśrednie (szac.)

Zadanie 3a

The diagram is a simplified model of a nerve cell communicating with a muscle fibre. Determine whether the axon is insulated, giving a visible reason.

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Biologia IBPaper 1A, maj 2025, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 11

The axons shown are at the same temperature. Which is expected to conduct an action potential most slowly? A. P B. S C. Q D. R

• Materiał graficzny

Biologia IBPaper 1A, maj 2025, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 12

The axons shown are at the same temperature. Which is expected to conduct an action potential most slowly? A. P B. S C. Q D. R

• Materiał graficzny

Biologia IBPaper 1A, listopad 2025, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 11

Myelinated fibres X,Y,Z conduct at6,45 and95m/s respectively. Which hypothesis could explain Z’s higher speed? A. Z has a much longer total axon B. Z has a larger axon diameter C. Z lacks nodes of Ranvier D. Z has the smallest diameter

Biologia IBPaper 2, listopad 2024, TZ2wzorowane3 pktotwarteśrednie (szac.)

Zadanie 5

The drawing represents a motor neuron. Name the structures indicated by X, Y and Z.

• Materiał graficzny

Biologia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 28

What is a function of the structure labelled X? A. It increases conduction speed along the axon B. It is the site where every neurotransmitter is released C. It contains the nucleus for the entire neuron D. It reverses the direction of every action potential

• Materiał graficzny