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微量元素的代謝受穩(wěn)衡機(jī)制調(diào)控

Issuing time:2020-05-22 00:00

微量元素的代謝受穩(wěn)衡機(jī)制調(diào)控。穩(wěn)衡調(diào)控在吸收、尿中排出、向腸腔的分泌、同紅細(xì)胞的交換、從肌肉中釋放幾個(gè)位點(diǎn)。多數(shù)學(xué)者認(rèn)為,腸道是微量元素穩(wěn)衡調(diào)控的主要場(chǎng)所,吸收與內(nèi)源分泌是機(jī)體穩(wěn)衡調(diào)控的主要方式。當(dāng)日糧供給水平較低時(shí),吸收增加,排泄減少。排泄主要經(jīng)糞便。糞便中除來源于日糧中未吸收部分之外,還有相當(dāng)部分來自于唾液、肝臟、胰臟、腸黏膜細(xì)胞等向腸腔的內(nèi)源分泌。機(jī)體攝入量大時(shí),肝臟、胰臟向小腸分泌的增加,從而使內(nèi)源排出增多,以達(dá)到調(diào)節(jié)營養(yǎng)的平衡。