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Natuurwetenskappe

Graad 9

Lewensprosesse: ‘n gesonde lewe

Module 4

Asemhalingsisteem van die mens

Struktuur van die asemhalingsisteem:

  • Jy het lugweë wat bestaan uit neusgange, mondholte, keel (farinks), 'n trachea (lugpyp) en twee bronchi (longpype).
  • Jy het twee longe bestaande uit duisende longsakkies/blasies of alveoli – die oppervlakte word dus vergroot tot so groot soos 'n pluimbalbaan!
  • Die diafragma en tussenribspiere .

Klasaktiwiteit: studie van skaap- of varklonge

  • Indien moontlik, moet jou onderwyser bogenoemde dele aan jou toon deur gebruik te maak van 'n skaap of vark se longe.

Die asemhalingsisteem van die mens

Prosesse

  • Behalwe voeding, is daar nog ander stelsels of sisteme in die mens wat belangrik is vir die doeltreffende funksionering van die liggaam. Ons gaan kyk na asemhaling, ekskresie, voortbeweging en die skelet, asook na voortplanting.
  • Elke sel in die liggaam van 'n lewende organisme moet suurstof hê vir RESPIRASIE . Dit is die ENERGIEGEWENDE PROSES waartydens glukose "verbrand" word in die teenwoordigheid van suurstof. Die afvalproduk is koolstofdioksied.
  • Die plek waar hierdie verbranding plaasvind binne-in selle, is die MITOCHONDRIA .
  • Die manier waarop al hierdie stowwe by die selle in- en uitkom, is met behulp van die bloedstroom.
  • Die manier waarop suurstof in die bloed beland, is deur ASEMHALING en GASWISSELING.
  • ASEMHALING : die proses waardeur lug in die longe in en daaruit beweeg met behulp van spiere. Ons noem dit INSPIRASIE (inaseming) en EKSPIRASIE (uitaseming).
  • GASWISSELING : die proses waardeur gasse soos koolstofdioksied en suurstof in die longe tot in die bloed beweeg, asook by die selle.
  • RESPIRASIE : die energiegewende proses in mitochondria in selle.

Aanpassing vir die prosesse:

  • Vir ASEMHALING is daar 'n DIAFRAGMA of spierplaat onder die longe wat inbult en drukking in die borskas verander; daar is ook TUSSENRIBSPIERE wat die ribbekas kan laat beweeg.
  • Vir GASWISSELING is daar duisende longblasies of ALVEOLI met baie dun bloedvatryke oppervlaktes wat klam is.
  • Vir RESPIRASIE is daar fyn bloedkapillêre wat tot by elke sel strek met WEEFSELVLOEISTOF wat elke sel omring; daar is ook vele mitochondria .
  • VERKLAAR ELKEEN VAN DIE AANPASSINGS IN DIE TABEL.
Diafragma
Tussenribspiere
Duisende alveoli
Bloedkapillêre met dun enkel-wande
Alveoli met enkellaagepiteel
Mukusmembrane met cilia

Klasopdrag: TEKENING

  • Maak 'n skets om die alveoli en 'n bloedkapillêr te toon wat die beweging van die gasse illustreer.

Assessering: TEKENING

Kon jy 'n korrekte skets teken?

[LU 2.3]

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

Asemhalingsisteem van die mens

VERKLAAR ELKEEN VAN DIE AANPASSINGS IN DIE TABEL:

Diafragma Borsholte vergroot/verklein
Tussenribspiere Borskas lig/sak
Duisende alveoli Vergroot oppervlak
Bloedkapillêre met dun enkel wande Kort diffusie-afstande
Alveoli met enkellaag epiteel Dun laag vir vinnige diffusie
Mukusmembrane met cilia Slymlaag vang partikels, cilia voer partikels en stof weg

KLASOPDRAG: TEKENING

  • Byskrifte: alveoli

Questions & Answers

What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit 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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