A researcher adds a substance that covers the receptor molecules on the membrane of the second neurone. An electrical impulse reaches the end of the first neurone, and neurotransmitter is released and diffuses across the synaptic gap.
What happens in the second neurone?
no new impulse is triggered, because the neurotransmitter cannot bind to the receptor molecules
a new impulse is triggered, because the neurotransmitter only needs to reach the membrane
a new impulse is triggered, because the substance carries the neurotransmitter into the neurone
no new impulse is triggered, because the substance stops its vesicles releasing neurotransmitter
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.