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食物的消化与吸收 PowerPoint PPT Presentation


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食物的消化与吸收. ( 第一课时 ). 食物的历程 :. 消化系统的组成. 口腔. 唾液腺. 咽. 胃腺. 消化腺. 食道. 肝脏. 消化道. 胃. 胰腺. 小肠. 肠腺. 大肠. 肛门. 咽. 口. 食道. 胃. 小肠. 大肠. 肛门. 消化道:. 口 : 咀嚼 ( 磨碎 ) 食物和初步消化食物 ( 淀粉 ). 咽 : 是食物和呼吸的共同通道. 食道 : 食物进入胃的通道. 胃 : 磨碎食物初步消化食物蛋白质能吸收少量水和酒精. 小肠 : 消化和吸收的主要场所. 大肠 : 形成并暂时贮存粪便能吸收少量水分.

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食物的消化与吸收

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