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2.3 The nervous system and brain

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Question 18

A patient may have a blood clot in the brain. A doctor uses a CT scan to find its position.

Why can a CT scan locate the blood clot precisely?

[1]
A

one X-ray records activity throughout the brain while the patient stays still

B

a radioactive tracer collects in the blood clot and produces a colour coded image

C

electrical stimulation near the blood clot produces a response that reveals its position

D

many X-ray readings are combined to make a detailed cross-sectional image

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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