<< Chapter < Page Chapter >> Page >

Natuurwetenskappe

Graad 9

Lewensprosesse: ‘n gesonde lewe

Module 10

Senuwees en sensitiwiteit

  • Sensitiwiteit is die vermoë wat jy het om op jou veranderende omgewing (intern en ekstern) te reageer.
TERM VERDUIDELIKING
Stimulus 'n Omgewingsverandering
Reseptore Spesiale selle of organe wat stimulus opvang
Impuls Boodskap soos wat dit vanaf reseptore na brein of rugmurg gaan
SSS Sentrale senuweesisteem: brein + rugmurg
Neuron Senuweesel
Effektore Spiere of kliere wat op boodskappe reageer

Aktiwiteit: TABELLE VOLTOOI - senuwees

1. Skryf die stimulusreaksiepad neer vir wanneer 'n by jou op die hand steek

2. Vul die byskrifte in op die skets van die brein en neuron.

Neuron

Brein

3. Voltooi die funksietabel:

STRUKTUUR FUNKSIE
Brein -----------------------------------------------------------------------------------
Rugmurg ----------------------------------------------------------------------------------
Motoriese neuron -----------------------------------------------------------------------------------
Sensoriese neuron -----------------------------------------------------------------------------------

5. VIND UIT:

  • Hoekom

a) jy jou oë knip

b) jou neus loop as jy gehuil het

c) jou pupille groot word in 'n donker vertrek

d) kos na niks proe as jou neus toe is nie

Die effekte van dwelmmiddels en alkohol op die brein

Wanneer jou liggaam pyn verduur, gebruik jy pynstillers om die pyn te verwyder. Jy kan dus baie maklik jou senuweesisteem se gevoelsvermoë beheer. Medikasie kan dus nuttig wees, maar soms word dit misbruik.

So word dwelmmiddels gebruik om opwinding te verskaf en dit is gevaarlik, aangesien dit AFHANKLIKHEID en 'n TOLERANSIE vir sekere vlakke kan bewerkstellig. Dit is dan wanneer sterker en meer dwelms gebruik moet word.

DWELMMIDDEL EFFEK
PYNSTILLERS :Morfien en Heroïen
  • onderdruk pyn
  • verdoof sintuie
STIMULANTE :Kaffeïne, nikotien, Ecstasy, anti-depressante
  • versnel breinaktiwiteit
  • angstigheid
  • lei tot depressie
KALMEERMIDDELS :Alkohol en slaappille
  • vertraag breinaktiwiteit
  • wilskrag, oordeel en selfbeheer aangetas
  • traagheid en visie-steurings
HALLUSINOGENE :Dagga en LSD
  • gevoel van behaaglikheid
  • ervaar iets wat nie daar is nie
  • skisofrenie

  • Waarom wend jong mense hulle tot dwelms?

Assessering: TOEPASSING

Kon jy jou kennis toepas?

[LU 2.4]

Assessering

LU 2

Konstruksie van Wetenskapkennis

Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Dit is bewys as die leerder:

2.1 betekenisvolle inligting kan onthou;

2.2 inligting kan kategoriseer;

2.3 inligting kan interpreteer;

2.4 kennis kan toepas.

Memorandum

Senuwees en sensitiwiteit

AKTIWITEIT: TABELLE VOLTOOI - senuwees

1. prikkel/stimulus – reseptor – impuls – sss – impuls – effektor

2. byskrifte: skets brein + neuron

3. Voltooi die funksie tabel:

STRUKTUUR FUNKSIE
Brein Besluitneming; redenasie; geheue; denkprosesse; sintuie;
Rugmurg Refleksreaskies
Motoriese neuron Impulse na spiere en kliere vanaf sss
Sensoriese neuron Impulse na sss vanaf simsorgane

4. a) refleksaksie om oog te smeer met smeermiddel

b) trane dreineer in traanbuis wat agter in keelholte open – ook agterkant van neusholte

c) opening vergroot om meer lig in te laat

d) neusreseptore tydelik uit aksie; tong proe net soet, suur, sout en bitter

Questions & Answers

what is phylogeny
Odigie Reply
evolutionary history and relationship of an organism or group of organisms
AI-Robot
ok
Deng
what is biology
Hajah Reply
the study of living organisms and their interactions with one another and their environments
AI-Robot
what is biology
Victoria Reply
HOW CAN MAN ORGAN FUNCTION
Alfred Reply
the diagram of the digestive system
Assiatu Reply
allimentary cannel
Ogenrwot
How does twins formed
William Reply
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
what is genetics
Josephine Reply
Genetics is the study of heredity
Misack
how does twins formed?
Misack
What is manual
Hassan Reply
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
Joseph Reply
what is biology
Yousuf Reply
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
Joseph Reply
what is the blood cells
Shaker Reply
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
Abdullahi Reply
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
What is classification
ISCONT Reply
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
Kenna Reply
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Natuurwetenskappe graad 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Natuurwetenskappe graad 9' conversation and receive update notifications?

Ask