Diabetes care
Diabetes care

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Diabetes care

3.7 胰高血糖素

胰高血糖素是胰脏产生的另外一种激素。

SAQ 5

你还记得是哪些细胞产生胰高血糖素的吗?

Answer

胰高血糖素是由胰脏中的朗格罕氏岛分泌产生的(如图2所示)。

胰高血糖素引起血糖值增加。血液中葡萄糖增加时胰高血糖素降低,葡萄糖降低时,胰高血糖素增加,与胰岛素的功能正好相反。胰高血糖素刺激肝脏分泌肝糖(肝糖是葡萄糖储存的一种形式,是从葡萄糖合成的分子)并将葡萄糖释放到血液当中去。

你可能会思考为什么身体会需要一种激素来提高血糖水平。除了要避免血糖过高的情况以外,身体还要求血糖浓度不能过低,因为这种情况下大脑不能正常工作,这种情况前面也提到过。通过刺激酵解产生许多激素能够提升葡萄糖浓度,胰高血糖素就是其中最重要的一种。

你已经阅读了身体一些非常复杂的过程。练习活动3看看你关于糖尿病的知识是否提升了。

活动3 喝含糖饮料的影响--复习

Timing: 建议学习时间为10分钟

做一个简要的记录:喝一杯含许多葡萄糖或者可消化的糖的饮料,观察其对a.糖尿病患者,b.非糖尿病患者的血糖浓度的影响。

Answer

你的答案与活动2有怎样的不同?对于非糖尿病患者来说,血糖浓度迅速升高,然后开始下降,处在一个正常的范围内。对于一个胰岛素不足的人来说,当他/她喝了含糖的饮料后,发现他们的血糖值会超出正常的范围。(血糖值会超过20mmol/l或者更多。)糖尿病患者的血糖值下降的速度要比胰岛素正常的人慢很多。喝了含糖饮料后,血糖值下降的水平取决于胰岛素的多少,如果根本就没有胰岛素,那么,血糖就依然会很高。

SK120_3

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