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自有生物以来,外在环境的大自然世界在不断的演变中。一般生物为了应付外在环境的刺激,也发生适当的反应,来适应个体的生存。在低级动物,因体内分化程度尚未完善,故对外界刺激具有直接发生反应的显明特性。淡不到什么神经系统。例如我们在水里常常看到的单细胞动物:(1)钟珠虫:仅具有单纯收缩反应。(2)阿米巴:个体的原形质具有敏感性及传导性,一旦受到外界刺激时,冲动就经过原形质向各方传导,且发生伪足来连动它的本体离开刺激区域,以保特它的生存。在生物进化过程中,由于生物反应形式的不断改变,因此就逐步形成了对复杂机体起调整主导作
Since its existence, the natural world of the external environment has continued to evolve. In order to cope with the excitement of the external environment, general organisms also respond appropriately to the individual’s survival. In low-grade animals, because the degree of differentiation in the body is not perfect, it has obvious characteristics of direct response to external stimuli. Fewer nervous system. For example, we often see single-celled animals in the water: (1) Clock worms: only with a simple contractile response. (2) Amoeba: The individual’s original modality has sensitivity and conductivity. Once subjected to external stimuli, impulses are transmitted to the parties through the original modality, and pseudo-foot occurs to move its body away from the stimulating area. Its survival. In the course of biological evolution, due to the constant changes in the form of biological reactions, the gradual adaptation of the body to the complex