plumiMyelination and saltatory conduction: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 8.1.4 Myelination and saltatory conduction, 2019–2025, with mark schemes and examiner’s reports where available.
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Q4(d)(ii)
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All 13 questions on Myelination and saltatory conduction, as a list
- January 2025, Unit 5, Q4(d)(ii) (2 marks): The effect of axon diameter and myelination on the speed of an impulse in four neurones was investigated. The table shows the results of this investigation. Axo
- June 2024, Unit 5, Q5(c)(i) (3 marks): Draw a myelinated motor neurone and label two structures. (3)
- January 2024, Unit 5, Q2(b)(iii) (3 marks): Explain how myelinated neurones enable a greater speed of transmission in a neurone. (3)
- October 2023, Unit 5, Q3(c) (2 marks): A person with ADEM has problems with walking. Explain why ADEM causes problems with walking. (2)
- June 2023, Unit 5, Q8(f) (2 marks): “Multiple sclerosis (MS) is a… demyelinating disease of the nervous system” (paragraph 14). Symptoms of MS include poor coordination and loss of vision. Explain
- October 2022, Unit 5, Q3(b)(iii) (3 marks): The nerve shown in the photograph contains many myelinated neurones. Explain why a myelinated neurone conducts an impulse faster than a non‑myelinated neurone o
- June 2022, Unit 5, Q5(b) (3 marks): Guillain‑Barré syndrome is a disorder of the nervous system. The immune system damages the myelin sheath surrounding the axons of individuals with Guillain‑Barr
- January 2022, Unit 5, Q6(c)(i) (3 marks): Calculate the percentage difference in the gradient of the myelinated and non‑myelinated neurones. The gradient for non‑myelinated neurones is 0.5. The equation
- January 2022, Unit 5, Q6(c)(ii) (3 marks): Explain why the speed of conduction differs in myelinated and non‑myelinated neurones. (3)
- June 2021, Unit 5, Q3(a) (3 marks): A myelinated axon conducts impulses faster than a non-myelinated axon of the same diameter. Explain this difference. (3)
- June 2021, Unit 5, Q3(b) (2 marks): Polyneuropathy is a disorder that damages the myelin sheath of neurones throughout the body. One symptom is muscle weakness. Muscle weakness is the reduced stre
- June 2021, Unit 5, Q3(c) (2 marks): Dementia is a condition associated with the ongoing decline of brain functioning. There are many types of dementia. The relationship between myelin in brain tis
- October 2020, Unit 5, Q6(a)(ii) (1 mark): Which row correctly compares the conduction of an impulse along a myelinated neurone with conduction along a non-myelinated neurone? (1) Compared with a non-mye
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