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Summary The nervous system grade 9

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This document provides a thorough, well-organized, and detailed set of notes on the nervous system, designed specifically for students preparing for exams or seeking to strengthen their understanding of human biology. Covering both the central nervous system (CNS) and the peripheral nervous system (PNS), these notes break down complex concepts into clear, digestible sections, including: • Structure and function of the brain and spinal cord • Neuron anatomy and how nerve impulses are transmitted • The role of sensory and motor pathways in responding to stimuli • Detailed explanations of reflex arcs and involuntary responses • How the nervous system interacts with other body systems Each section is written in an easy-to-understand style, complemented by diagrams, tables, and concise summaries to enhance learning and revision efficiency. These notes are ideal for students aiming to excel in class tests, exams, and practical assessments. Not only is this resource comprehensive for classroom use, but it is also optimized for online searchability. With clearly structured headings and keywords such as “nervous system,” “neurons,” “reflex arcs,” and “human biology,”

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Institution: 9th Grade
Course: Life Sciences
Schooljaar: 103

All documents for this subject (47)

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Uploaded on: October 23, 2025
Number of pages: 7
Written in: 2025/2026
Type: Summary

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nervous system

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The nervous
system
voustissue

voustissue isspecialised toreacttostimuliandto conductimpulsestovariousorgans inthebodywhichbringabouta response tothestimulus

wetissueare allmadeupof specialisednervecellscalledneurons brain spinalcordandperipheralnerves thatbranchthroughoutthebody

ronsareeasilystimulatedandtransmitimpulsesveryrapidly Anerve is madeupofmanynervecellfibres neurons boundtogether
by t

ruous system summarised

Nervoussystem

CNS PNS

somatic vs autonomic vs

sympathetic vs parasympathetic vs

entral Nervous system Brain and spinal cord recievesinfofrombrain PNS

eriphral Nervous system sends signalsfrom CNS toother parts of bodyseparatedintosoautonomic

omatic Nervous system Controls voulentry actions

utonomic Nervous system Controls invoulentry actions

ympatheticNervous system Activates when in stressful situation Flightfight or Freeze

arasympathetic Nervous system Activates in peaceful situation

, timuli external andinternal change

eceptor detecs a stimulus

ffector part of bodythat respondes to stimulus

Cerebrum largestpartofBrain Controlls all voulentry actions
onsists of 4lobes

rontallobe reasoningplanningspeechmovementemotionsandproblemsolving

arietallobemovement orientationrecognitionperception of stimuli

capitallobevisualprocessing

mporallobeperceptionandrecognitionofauditorystimulimemoryandspeech

TSA
rinkles on thebrain increases total surface areato storemoreneurons which increases efficiency

Frontal
Parietal
Occipital

Temporal

Beak
Medulla Relays signals between the Brain and spinal cords
oblongata
Controls
involentry functions

Respiration
an Cerebellum

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Summary The nervous system grade 9

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