在人和高等动物体内由特殊腺体和细胞分泌的物质能起到化学信号的作用.请据图分析并回答图中a代表下丘�神经细胞b代表垂体细胞d代表血管 Template




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tomski在人和高等动物体内由特殊腺体和细胞分泌的物质能起到化学信号的作用.请据图分析并回答图中a代表下丘�神经细胞b代表垂体细胞d代表血管 coloring