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英《新科学家》第88卷第1232、1233期(1980年)报道:神经纤维的传导是一种生物电现象。由于一些离子[主要是钠离子(Na~+)和钾离子(K~+)]在细胞膜两侧的分布,使细胞在静息状态下膜内呈负电。静息状态下,钠离子不易透过细胞膜,由于“钠泵”的作用,使膜内钠离子的浓度低于膜外。钾离子易透过细胞膜,静息状态下膜内钾离子浓度高于膜外,因此,钾离子有从膜内向膜外流出的倾向,使膜内外钾离子浓度趋于平衡,但受到细胞的负电吸引也向内流进。这些相反的力作用结果,形成细胞膜的“静息电位”,约80毫伏。当神经冲动通过时,细胞膜的各段连续去
The New Scientist, Volume 88, Issue 1232, issue 1233 (1980) reports that the conduction of nerve fibers is a bioelectric phenomenon. Due to the distribution of some ions [mainly sodium ions (Na ~ +) and potassium ions (K ~ +)] on both sides of the cell membrane, the cells are negatively charged in the resting state. Resting state, sodium ions difficult to penetrate the cell membrane, due to the “sodium pump” effect, so that the membrane sodium concentration lower than the membrane. Potassium ions are easy to penetrate the cell membrane, resting potassium ions in the membrane concentration higher than the membrane, therefore, potassium ions from the membrane to the membrane out of the propensity to potassium and potassium ions within and outside the membrane concentration to balance, but by the negative cell Attraction also inward flow. As a result of these opposing forces, the “resting potential” of the cell membrane forms about 80 mV. When the nerve impulses pass through, the segments of the cell membrane continue to go