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Diffusion

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Diffusion
Undersøgelse af betydningen af overflade/rumfangs-forholdet

Resultat og efterbehandlingen: Resultater Kantlængde cm | Tværsnit af terning | Overflade cm2 | Rumfang cm3 | Overflade i forhold til rumfang | Ufarvet rumfang | 3x3 | | 54 cm2 | 27 cm3 | 2 | 5,04 cm3 | 2x2 | | 24 cm2 | 8 cm3 | 3 | 1,331 cm3 | 1x1 | | 6 cm2 | 1 cm3 | 6 | 0,216 cm3 | Efterbehandling Overflade:
6* (L*b)
6*3*3= 54 cm2 Rumfang:
L*b*h
3*3*3= 27 cm3
(Det samme gør man, når man udregner det ufarvet rumfang. Man minusser det dog med Rumfang.) O/R:
Overfladen/rumfanget
27/54= 2

Diskussion: a. Det vil den lille terning på 1x1. Det vil den, fordi overfladen i forhold til rumfanget er større i den lille terning end i de større. Det har vi også i forsøget bevidst, da det er den lille terning, der er bedst til at diffundere eddike pga. O/R b. Højden=1 bredde=1 Længde=27

Overflade arealet bliver større, så stoffet nemmere kan diffundere ind i organismen. Desto større overfladearealet er i forhold til rumfanget, desto nemmere har stoffet ved at diffundere ind, derfor er firkantens overfladeareal blevet større. Vi bevidste også i forsøget, jo mindre rumfanget er i forhold til overfladen er, desto mere af eddiken blev diffunderet ind, fordi firkanten, hvor O/R er størst har et mindre ufarvet rumfang.

c. Længde*bredde*højde= 27*1*1= 27 cm3
Rumfanget er ligesom firkanten med kantlængden= 27 cm3

Længde* 4 sider= 4*27= 108 bredde *Højde*2 sider= 1*1*2= 2
108+ 2= 110 cm3 overfladen for den organisme jeg tegnede= 110 cm2

O/R i den firkante jeg tegnede= 4 Forholdet mellem O/R i firkant og med kantlængden og firkanten jeg tegnede er større. I den firkant jeg tegnede er O/R dobbelt så stort, som i firkanten med kant længden 3. Det er den fordi, rumfanget i begge firkanter er det samme, men overfladearealet i den jeg tegnede er større. d.

Kantlængde i cm | Overflade i cm2 | Rumfang i cm3 | O/R- forholdet | 0,01 cm | 0,0006 cm2
(6*(0,01*0,01)) | 0,000001 cm3
(0,01*0,01*0,01) | 600
(0,0006/0,000001) | e. Blodet bliver transporteret ud i cellerne igennem blodårende, hvis der kun gik en blodåre igennem f.eks din arm ville det være en svær og en meget lang proces at transportere ilt til de inderste celler, som er gemt bag flere milliarder af celler, De vil nemmelig først skulle diffunderes ind i gennem de andre celler, før den celle som har brug for f.eks ilten eller glukose. Denne proces ville tage flere år. Der er derfor forgreninger på blodårene, også kaldt arterier, artioler og kapillærer (der er forskel på størrelsen). De forgrener sig ud fra blodårene og ud i f.eks armen Der er rigtige, rigtig mange af disse forgreninger, så blodet nemmer og meget hurtigere kan transporter blodet ud til celler alle steder i f.eks armen, fordi forgreningerne dækker et meget større areal end bare blodåren.

f. Bændelormen klare sig bedre end spoleormen gør. Det gør bændelormen, fordi den har nemmer og hurtigere ved at diffundere livsnødvendige stoffer ind, som f.eks glukose, ilt osv. Bændelormen klare sig bedre, fordi den er flad, og derfor har et større overfladeareal, hvorimod spolormen er rund og har et større rumfang i forhold til overfladearealet. Som vi også igennem forsøget har bevidst, så diffunderes stoffer nemmere når overfladearealet er større i forhold til rumfanget, og derfor ville bændelormen nemmere kunne diffundere stoffer end spolormen. Det kunne derfor tænkes at spolormen ville tilpasse sig en mere flad kropsform. ¨

Konklusion: Jeg kan konkludere at O/R har en betydning for diffusion. Jo større overfladen er i forhold til rumfanget, desto hurtigere har stoffet ved at diffundere ind i cellen, stoffet kan diffunderes flere steder, når overfladearealet er størst, og fordi stoffet når det bliver diffunderet hurtigere når midten af organismen, fordi rumfanget er mindre. Vi har bevidst dette i vores forsøg, da terningen med det største O/R have hurtigere ved at diffundere eddiken.

Firkanten inden eddiken er diffunderet ind. Firkanten efter eddiken er diffunderet ind.

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