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CAIE IGCSE Biology 14.1.9 Events At a Synapse Questions

Practise how an impulse triggers neurotransmitter release, diffusion across the gap and receptor binding that stimulates the next neurone.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • sequence impulse-triggered neurotransmitter release, diffusion across the synaptic gap, receptor binding and stimulation of the next neurone
  • describe neurotransmitter diffusion down a concentration gradient across the synaptic gap
  • explain drug or disease effects on synaptic transmission through blocked receptors or reduced neurotransmitter release

CAIE IGCSE Biology 14.1.9 Events At a Synapse Questions question 1

[Maximum number: 3]

Pregnancy can occur after the fusion of a male gamete and a female gamete.

Fig. 2.2 shows the junction between two neurones with drug X absent and two neurones with drug X present, immediately after a painful stimulus.

Fig. 2.2

Fig. 2.2

Describe and explain how drug X affects the function of the relay neurone shown in Fig. 2.2.

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