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2.3 The nervous system and brain

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Question 2

During an investigation of the pupil reflex, transmission along the relay neurone in the brain is selectively blocked. No other cells are affected.

A bright light is shone into the eye. A detector records whether an impulse arrives at the end of the sensory neurone, and the pupil diameter is measured.

Which pair of observations is expected?

[1]
A

an impulse is detected; the pupil diameter does not decrease

B

no impulse is detected; the pupil diameter does not decrease

C

an impulse is detected; the pupil diameter decreases

D

no impulse is detected; the pupil diameter decreases

Markscheme

2.3 The nervous system and brain Questions

  1. GCSE
  2. /Biology
  3. /2.3 The nervous system and brain

111 exam-style questions on Edexcel GCSE Biology 2.3 The nervous system and brain, covering 2.3.1 Structures and functions of the brain, 2.3.2 Imaging brain function with scanning, 2.3.3 Limitations in treating nervous system damage, 2.3.4 Neurones and impulse transmission, and 2.3.5 Structure and function of a reflex arc. Each one has a worked solution and a mark scheme showing where the marks go.

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