胰腺的内分泌部分,是分散在胰腺中的不规则的细胞群。胰岛至少有三种细胞:A(或a2)细胞分泌胰高血糖素;B(或β)细胞分泌胰岛素;近来又发现一种细胞,称为D(或δ或α1)细胞,它在正常情况下分泌生长激素释放抑制激素。D细胞增生或发生肿瘤时,分泌大量胃泌素,称为胃泌素瘤。可引起胃酸分泌过多的消化性溃疡。胰岛这些细胞紧靠在毛细血管上,所分泌的激素,通过毛细血管壁渗入血液内,有调节糖代谢的作用。
胰岛素使人体能够利用和贮存糖分。
她从16岁起就开始自行注射胰岛素。
She has been injecting herself with insulin since the age of 16.
胰岛素是胰腺分泌的。
They're making that because you need this protein insulin, it's a hormone, and it's important for sugar metabolism in your body.
它们产生胰岛素蛋白是因为你需要它,胰岛素是一种激素,它在糖代谢中起着非常重要的作用
A pancreas--cell in the pancreas, for example, needs to make insulin and so the gene for insulin is transcribed.
举个例子,一个胰腺细胞,要分泌胰岛素,那么编码胰岛素蛋白的基因就会被转录
If it was directly transcribed there'd be regions that are important for making insulin and regions that are not.
如果直接转录的话,那被转录的序列中就会既包括了,和生成胰岛素有关的重要区域,也包括了与之无关的区域
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