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CAIE IGCSE Biology 14.1.9 Events at a synapse

Practise sequencing neurotransmitter release, diffusion and receptor binding to explain how an impulse crosses a synapse.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • sequence release from vesicles, diffusion across the gap and binding to receptors
  • describe neurotransmitter movement down a concentration gradient across the synaptic gap
  • explain drug or disease effects using blocked receptors or fewer neurotransmitters released

14.1.9—Events at a synapse 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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