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人体内环境稳态的维持，依赖于各个器官、系统的协调活动，而信息分子是它们之间的“语言”。请结合下图回答(1)至(2)题。 (1)当身体的感受器受到寒冷刺激时，产生的兴奋由________神经传至体温调节中枢，通过一系列调节，可引起__________分泌增多，该激素作用于全身细胞，提高细胞代谢的速率，增加产热量。完成该反射的结构基础是___________。 (2)图中①表示__________系统；“甲”表示增殖分化，产生浆细胞和_________细胞。体内蛋白质合成不足可能会导致抗体数量减少和血浆渗透压__________，从而使机体出现免疫力下降、组织水肿。
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