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3.1 Coordination and control – the nervous system

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Question 31

A researcher measures the time taken for an impulse to travel along two different axons. The results are shown in the table.

AxonLength of axon / mTime taken / s
P0.900.009
Q0.0060.006
a.

Suggest which axon is likely to have a myelin sheath. Use the data to give a reason for your answer.

[2]
b.

Explain how the myelin sheath affects the speed of an impulse.

[2]
Markscheme

3.1 Coordination and control – the nervous system Questions

  1. GCSE
  2. /Biology
  3. /3.1 Coordination and control – the nervous system

135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.

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