Chapter 7 · ICSE Class 8 Biology (Selina Concise)

Nervous System

Deepen your understanding of the nervous system, including neurons and how nerve impulses travel.

🧠 Chapter 7

The central nervous system and peripheral nervous system compared The central nervous system consists of the brain and spinal cord, while the peripheral nervous system consists of the nerves that branch out to the rest of the body Central Nervous System Brain + Spinal Cord Peripheral Nervous Nerves throughout body PNS connects the body to the CNS
7.1

Neurons

Neurons are specialized cells that transmit nerve impulses. They have dendrites (receive signals), a cell body, and an axon (sends signals).

1

What part of a neuron receives signals from other neurons?

Dendrites

2

What part of a neuron sends signals to other neurons?

The axon

7.2

Central and Peripheral Nervous System

The central nervous system (brain and spinal cord) processes information. The peripheral nervous system (nerves throughout the body) carries signals to and from the central nervous system.

1

What makes up the central nervous system?

The brain and spinal cord

2

What is the role of the peripheral nervous system?

Carrying signals between the central nervous system and the rest of the body

Practice

Exercises

1. What is a neuron?

2. What part of a neuron receives signals?

3. What part of a neuron sends signals?

4. What makes up the central nervous system?

5. What does the peripheral nervous system do?

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