Q1
What makes up the central nervous system?
ABrain and spinal cord
BOnly nerves
COnly the brain
DOnly the spinal cord
ICSEClass 8 (ICSE)ScienceCh 24 · Topic 1
The Nervous System
The nervous system, including the brain, spinal cord, and nerves, controls body functions and enables us to sense and respond to our environ
Core concept
The central nervous system (brain and spinal cord) processes information, while the peripheral nervous system (nerves) connects it to the rest of the body.
How it works
Neurons are specialised cells that transmit electrical signals throughout the nervous system, forming complex networks for communication.
Why it matters
Reflex actions, like pulling away from something hot, happen quickly through the spinal cord without waiting for the brain's conscious decision.
Key detail
Understanding the nervous system helps explain how we think, move, sense our surroundings, and react to different situations.
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Quick notes
• Central nervous system: brain and spinal cord.
• It processes information.
• Peripheral nervous system: nerves connecting to the body.
• Neurons transmit electrical signals.
• They form complex communication networks.
• Reflex actions happen quickly via the spinal cord.
• They don't wait for conscious brain decisions.
• The nervous system enables thought, movement and sensing.