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3.1 Coordination and control – the nervous system

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Question 17
H

The Figure shows a synapse between two neurones. The arrow shows the direction of the impulse.

Figure image

a.

Use the Figure to explain why impulses can only travel in one direction across this synapse.

[2]
b.

Some painkillers bind to receptors T on the neurones that carry impulses from pain receptors to the brain.

Explain how these painkillers stop a person feeling pain.

[3]
c.

Normally, the chemical in gap S is broken down quickly by an enzyme. A nerve gas stops this enzyme from working.

Suggest the effect of the nerve gas at synapses between motor neurones and muscles.

[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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