chapter 2 sistem pencernaan
DESCRIPTION
PENCERNAANTRANSCRIPT
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SISTEM PENCERNAAN
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PENCERNAANPencernaan ialah proses penguraian molekul makanan yang kompleks kepada molekul makanan yang lebih ringkas yang boleh larut dan sedia diserap oleh badan.
Melibatkan proses pencernaan fizikal dan pencernaan kimia.
Terdiri daripada salur pencernaan, yang bermula dari mulut dan berakhir diubur.
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• Semasa pengunyahan, makanan dicampurkan dengan air liur
• Air liur melembutkan makanan dan menjadikannya lebih mudah ditelan.
• Air liur mengandungi sejenis enzim iaitu amilase. Amilase menghidrolisis kanji masak kepada maltosa
KANJI AMILASE MALTOSA
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Peristalsis - penguncupan dan pengenduran beritma yang berlaku di sepanjang salur alimentari.
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• Duodenum menerima hempedu dari pundi hempedu dan jus pankreas dari pankreas• Hempedu disintesiskan oleh hati dan disimpan dalam pundi hempedu. Hempedu disalurkan melalui duktus hempedu ke dalam duodenum apabila diperlukan
• Hempedu mengandungi garam hempedu, tetapi tidak mempunyai enzim
• Fungsi hempedu : Mengemulsikan lemak (memecahkan lemakmenjadi titisan halus yang terampai di dalamair). Pengemulsian lemakmenambahkan
jumlahluas permukaannya untuk tindakan enzim
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