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2.3 The nervous system and brain

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Question 10

A laboratory chemical has a shape complementary to receptor molecules on a receiving neurone. The chemical binds to and activates these receptors, even when the sending neurone has not released a neurotransmitter.

What is the most likely effect?

[1]
A

vesicles in the receiving neurone may release neurotransmitter into the synaptic gap

B

an electrical impulse may cross the synaptic gap without a chemical signal

C

the receiving neurone may remain inactive until the sending neurone releases neurotransmitter

D

an impulse may start in the receiving neurone without a signal from the sending neurone

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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