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                                                                                                                                              首頁 > 技術與支持 > 消化過程包括機械性消化和化學性消化兩種形式
                                                                                                                                              消化過程包括機械性消化和化學性消化兩種形式
                                                                                                                                              點擊次數:63 發布時間:2022-10-21
                                                                                                                                                消化系統由消化管和消化腺兩部分組成。消化管是一條起自口腔延續為咽、食管、胃、小腸、大腸、終于的很長的肌性管道,包括口腔、咽、食管、胃、小腸(十二指腸、空腸、回腸)和大腸(盲腸、結腸、直腸)等部。
                                                                                                                                                消化腺有小消化腺和大消化腺兩種。小消化腺散在于消化管各部的管壁內,大消化腺有三對唾液腺(腮腺、下頜下腺、舌下腺)、肝和胰,它們均借導管,將分泌物排入消化管內。
                                                                                                                                                消化系統的基本功能是食物的消化和吸收,供機體所需的物質和能量,食物中的營養物質除維生素、水和無機鹽可以被直接吸收利用外,蛋白質、脂肪和糖類等物質均不能被機體直接吸收利用,需在消化管內被分解為結構簡單的小分子物質,才能被吸收利用。食物在消化管內被分解成結構簡單、可被吸收的小分子物質的過程就稱為消化。這種小分子物質透過消化管粘膜上皮細胞進入血液和淋巴液的過程就是吸收。對于未被吸收的殘渣部分,消化道則通過大腸以糞便形式排出體外。
                                                                                                                                                在消化過程中包括機械性消化和化學性消化兩種形式。
                                                                                                                                                食物經過口腔的咀嚼,牙齒的磨碎,舌的攪拌、吞咽,胃腸肌肉的活動,將大塊的食物變成碎小的,使消化液充分與食物混合,并推動食團或食糜下移,從口腔推移到,這種消化過程叫機械性消化,或物理性消化。
                                                                                                                                                化學性消化是指消化腺分泌的消化液對食物進行化學分解而言。由消化腺所分泌的種消化液,將復雜的各種營養物質分解為腸壁可以吸收的簡單的化合物,如糖類分解為單糖,蛋白質分解為氨基酸,脂類分解為甘油及脂肪酸。然后這些分解后的營養物質被小腸(主要是空腸)吸收進入體內,進入血液和淋巴液。這種消化過程叫化學性消化。
                                                                                                                                                機械性消化和化學性消化兩功能同時進行,共同完成消化過程。
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