Psychology149 views·Updated Jun 15, 2026·2 pages

Understanding the Human Nervous System

Alice Crosby@alicecrosby_ufrm

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Your nervous system is like your body's incredibly sophisticated communication...

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# THE STRUCTURE + FUNCTION OF THE NERVOUS SYSTEM
Subdivisions of the human nervous system

# The Nervous System

# The Central Nervous
Syste

The Structure of Your Nervous System

Your nervous system splits into two major parts that work together like a brilliant team. The Central Nervous System (CNS) acts as your body's master control unit, whilst the Peripheral Nervous System (PNS) serves as your link to the outside world.

The CNS includes your brain, brain stem, and spinal cord. Your brain is the ultimate decision-maker and the centre of all conscious awareness - basically, it's where "you" live! The brain stem connects your brain to your spinal cord and handles crucial jobs like regulating sleep. Meanwhile, your spinal cord works like a motorway of nerves, carrying messages back and forth between your brain and the rest of your body.

The PNS is your body's communication network with the outside world. It transmits information about everything you do voluntarily and keeps your CNS connected to every other part of your body. Without it, your brain would be completely isolated!

Key Point: Think of the CNS as mission control and the PNS as all the communication satellites - they need each other to function properly.

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How Your Nervous System Responds to Danger

The PNS has two incredible subsystems that handle different types of body functions. The Somatic Nervous System (SNS) controls your voluntary movements - like deciding to wave at a mate or kick a football. It carries sensory information from your eyes, ears, and other organs to your CNS, then relays movement commands back to your muscles.

The Autonomic Nervous System (ANS) runs all the stuff you don't consciously think about - heart rate, breathing, digestion, and pupil size. It operates automatically, which is brilliant because imagine having to remember to make your heart beat!

The ANS has two divisions that work like opposite forces. The sympathetic division prepares your body for action during stress (the famous "fight or flight" response), whilst the parasympathetic division calms everything down and helps you conserve energy when danger passes.

Exam Tip: Remember the bear scenario - sympathetic gets you ready for danger, parasympathetic helps you chill out afterwards, somatic controls voluntary movements, and the PNS sends sensory messages about what you see.

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Psychology149 views·Updated Jun 15, 2026·2 pages

Understanding the Human Nervous System

Alice Crosby@alicecrosby_ufrm

Add to Google sources

Your nervous system is like your body's incredibly sophisticated communication network, constantly sending messages to keep you alive and responding to the world around you. Think of it as having two main departments - the central command centre and the...

of 2

The Structure of Your Nervous System

Key Point: Think of the CNS as mission control and the PNS as all the communication satellites - they need each other to function properly.

of 2

How Your Nervous System Responds to Danger

Exam Tip: Remember the bear scenario - sympathetic gets you ready for danger, parasympathetic helps you chill out afterwards, somatic controls voluntary movements, and the PNS sends sensory messages about what you see.