Science (086) — AI-generated practice question

At the synapse: When an electrical impulse reaches the end of an axon, it triggers the release of chemicals (neurotransmitters) into the synaptic gap. These chemicals cross the gap and start a similar electrical impulse in the dendrite of the next neuron.

Why chemical signal is important: A chemical signal is necessary because it allows control over whether the next neuron fires or not. It enables signal amplification, integration of multiple inputs, and communication with non-nervous cells like muscle and gland cells. A direct electrical connection would not allow such regulation or flexibility in the body's responses.

Source: Chapter 6, Section 6.1 – Animals: Nervous System

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• Examiners expect two clear parts: what happens at the synapse (process) and why chemical conversion is important (reason/advantage).
• Key terms to use: synapse, chemicals/neurotransmitters, electrical impulse, dendrite, axon.
• The textbook passage implies the chemical step allows transmission to muscle/gland cells too — mention this for full marks.
• Avoid vague phrases like "it helps the body" — be specific about regulation and flexibility.