In a laboratory preparation, no electrical impulse reaches the end of the first neurone. A treatment causes vesicles in this neurone to release neurotransmitter into the synaptic gap. The next neurone has its normal receptor molecules.
What is the most likely result?
a new electrical impulse starts in the next neurone, because the vesicles cross the gap and join the receptors
no impulse starts in the next neurone, because receptors respond only while the first neurone carries an impulse
no impulse starts in the next neurone, because the neurotransmitter is reabsorbed before it can bind
a new electrical impulse starts in the next neurone, because the neurotransmitter binds to the receptor molecules
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.