At a synapse in a reflex arc, which event allows the signal to pass from one neurone to the next neurone?
An electrical impulse crosses the gap and binds to receptors on the next neurone.
A hormone travels in the blood and stimulates an impulse in the next neurone.
A chemical diffuses across the gap and stimulates an impulse in the next neurone.
A receptor cell contracts across the gap and pulls on the next neurone.
40 exam-style questions on AQA GCSE Biology 5.2 The human nervous system, covering 5.2.1 Structure and function, 5.2.2 The brain, 5.2.3 The eye, and 5.2.4 Control of body temperature. Each one has a worked solution and a mark scheme showing where the marks go.