在人和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根据图分析图中a代表下丘�神经细胞b代表垂体细胞d代表血管下列说法 Template




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tomski在人和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根据图分析图中a代表下丘�神经细胞b代表垂体细胞d代表血管下列说法 coloring