糖类和脂肪营养物质开始在人体哪个部位消化以及整个消化吸收过程

高中生物我要更精确的啊,就是很详细地包括消化系统
2024-11-14 17:25:53
推荐回答(2个)
回答1:

糖类在口腔内被唾液消化 再在小肠内被胰液消化,然后是肠液,变成葡萄糖后被小肠上皮细胞主动运输
脂肪被胆汁分解成小段脂肪后被小肠上皮细胞胞吞

消化系统由消化道和消化腺两部分组成。
消化道是一条起自口腔延续为咽、食道、胃、小肠、大肠、终于肛门的很长的肌性管道,包括口腔、咽、食管、胃、小肠(十二指肠、空肠、回肠)及大肠(盲肠、结肠、直肠)等部。
消化腺有小消化腺和大消化腺两种。小消化腺散在消化管各部的管壁内,大消化腺有三对唾液腺(腮腺、下颌下腺、舌下腺)、肝和胰,它们均借助导管,将分泌物排入消化管内。
共有5个消化腺,分别为:唾液腺(分泌唾液、唾液淀粉酶将淀粉初步分解成麦芽糖)胃腺(分泌胃液、将蛋白质初步分解成多肽)、肝脏(分泌胆汁、储存在胆囊中将大分子的脂肪初步分解成小分子的脂肪,称为物理消化,也称作“乳化”)、胰脏(分泌胰液、胰液是对糖类,脂肪,蛋白质都有消化作用的消化液)、肠腺(分泌肠液、将麦芽糖分解成葡萄糖,将多肽分解成氨基酸,将小分子的脂肪分解成甘油和脂肪酸,也是对糖类,脂肪,蛋白质有消化作用的消化液)。

回答2:

精确的说进入口腔即开始消化,大多数物质吸收的场所在十二指肠。

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