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Summary selrespirasie
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biologie selrespirasie graad 12 ieb
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Selrespirasie: vind in selle van alle plante en diere plaas
energie word as ATP vrygestel wanneer glukosemolekules afgebreek word
energie word deur lewende selle vir verskeie lewensprosesse gebruik
wanneer glukose in teenwoordigheid van O 2 afgebreek word = laat baie energie vry
= aërobiese respirasie
Wanneer glukose afgebreek word en geen O 2 teenwoordig is nie = word slegs geringe
hoeveelheid energie vrygestel
= anaërobiese respirasie
Aërobiese respirasie:
C6H12O6 + 6O2 6H20 + 6CO2 + 38ATP (ensieme bo )
Glukose + suurstof water + koolstofdioksied + energie
Afbreek van glukose deur O2 te gebruik om energieryke waterstofatome vry te laat
O2 word van asemhaling verkry
Energie in waterstofatome word gebruik om energieryke ATP te vorm
Waterstofatome bind dan met O2 en vorm H2O
CO2 en H2O = vrygestel as afalprodukte
Proses van aërobiese respirasie: (3 fases)
1. Glikolise:
vind in sitoplasma plaas
glukose word tot pirodruiwesuur afgebreek
energieryke waterstofatome word afgegee en hul beweeg in mitochondria in waar hul in
oksidatiewe fosforilasie gebruik word
2 ATP-molekules ook tydens glikolise geproduseer
2. Krebs-siklus:
Vind in mitochondria plaas
Pirodruiwesuur word in energieryke waterstofatome en CO 2 afgebreek
Energieryke waterstofatome word tydens oksidatiewe fosforilasie gebruik en CO 2 word
as gas afgegee, wat dan uitgeasem word
3. Oksidatiewe fosforilasie:
Vind in mitochondria plaas
Energie van waterstofatome word gebruk om energieryke ATP te maak
Waterstofatome verloor energie en verbind met O 2 om H2O te vorm
Word as waterdamp uitgeasem of deur niere uitgeskei
Een glukosemolekule produseer 38 ATP-molekuoles
Energie gebruik vir alle lewensprosesse van selle, soos: groei, beweging en vervoer van bestandele en
selmembrane
Faktore wat tempo van aërobiese respirasie beïnvloed:
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