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1.9 Senuwees

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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 does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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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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