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2.3 The nervous system and brain

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Question 8

Bright light causes the pupil of an eye to become smaller.

Statement W: a receptor converts the light stimulus into an electrical impulse.

Statement X: a relay neurone carries the impulse from the brain to the iris.

Statement Y: an iris muscle is an effector that contracts.

Which statements are correct?

[1]
A

W and X only

B

X and Y only

C

W only

D

W and Y only

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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