This introduction covers Your Body's Lightning-Fast Communication Network within Nervous System for GCSE Biology. Topic 2: Nervous System It is section 1 of 18 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
⚡ Your Body's Lightning-Fast Communication Network
Imagine you're walking and suddenly step on a sharp stone. Before you even feel the pain, your foot has already lifted off the ground. How? Your nervous system detected the danger, processed it, and triggered a response — all in a fraction of a second. It's like having millions of tiny messengers sprinting through dedicated highways inside your body, carrying urgent instructions at speeds of up to 120 metres per second. No email, no text message — just pure electrical impulses racing along specialised cells called neurones.
Practice questions for Nervous System
What are the two organs that make up the central nervous system (CNS)?
Explain how a signal is transmitted across a synapse from one neurone to the next.