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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

Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Miggie Reply

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Source:  OpenStax, Natuurwetenskappe graad 9. OpenStax CNX. Sep 15, 2009 Download for free at http://cnx.org/content/col11068/1.1
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