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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

how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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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