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Summary Graad 9 Natuurwetenskappe _ Menslike Voortplanting Stelsel
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'n Opsomming van die Menslike Voortplanting Stelsel.
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, VOORTPLANTINGSTELSELDOEL / FUNKSIE VAN DIE VOORTPLANTINGSTELSEL:
p om te verhoed dat spesies uitsterf
p om nuwe individue voort te bring om uitsterwing te voorkom
PUBERTEIT
DOEL:
Puberteit is die tyd wanneer 'n kind se liggaam ontwikkel en verander. Die geslagsorgane
word ryp en stel die liggaam in staat om geslagselle (gamete) te produseer = mans moet
sperm produseer en dan sorg dat dit in aanraking met die vroulike eiersel kom en vroue
produseer (en stoor) eierselle wat deur 'n manlike spermsel bevrug kan word.
p geslagshormone word die eerste keer in bloed vrygestel tydens puberteit
p geslagshormone is verantwoordelik vir liggaamlike veranderinge genaamd sekondêre
geslagskenmerke
SEUNS MEISIES
p testikel en penisgrootte neem toe p borste ontwikkel
p hare begin groei in die pubiese area, p pubiese hare begin groei asook onder
ledemate, bors en gesig armhare
p stem verdiep a.g.v groei van larinks in p menstruasie vind plaas in ‘n maandelikse
die keel siklus
p liggaamsvorm-veranderinge vind plaas p liggaamsvorm verander a.g.v
p liggaamsreuk en aknee ontwikkel toenemende konsentrasies van
estrogeen
p liggaamsreuk en aknee ontwikkel
Hipofise – is ‘n klein ertjievormige klier onder die brein wat hormone in bloed vrystel
Testosteroon – manlike geslagshormoon wat in testes gemaak word
Estrogeen en progesteroon – vroulike geslagshormoon wat in die ovariums gemaak word
43 Noted © NATUURWETENSKAPPE GRAAD 9 www.notedsummaries.co.za
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