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问题:

下列哪些物质在小肠的吸收需钠泵参加? A.葡萄糖 B.氨基酸 C.水 D.脂溶性维生素

下列哪些物质在小肠的吸收需钠泵参加?

A.葡萄糖

B.氨基酸

C.水

D.脂溶性维生素


  参考答案

正确答案:AB

131.答案:AB

[考点] 小肠内营养物质的吸收原理

[分析] 水在小肠的重吸收是被动的 (渗透压梯度是吸收的动力),不需钠泵参与;脂溶性维生素是溶在脂肪中与脂肪一起吸收的,脂肪的吸收不需钠泵,因此,脂溶性维生素的吸收也不需钠泵;葡萄糖和氨基酸的吸收都是耗能的主动过程(继发性主动转运),转运系统均与钠的转运偶联,故均需钠泵参加。

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