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心肌收缩的动作电位包括除极化与复极化两个过程。当心室肌受到刺激时,胞膜的静息电位减少(负值变少),达到阈值电位时(大约-70mV),细胞膜上的“快通道”被激活而开放,膜外钠离子迅速流入膜内,膜内电位急剧上升,由负变正,这一过程称为除极化(0期)。心肌细胞除极后,由于细胞内的代谢过程,胞膜重新恢复了对钾、钠离子的通透性,细胞内由正电位逐渐恢复到静息膜电位水平,这一过程称复极化。复极早期快
Myocardial contraction action potentials include depolarization and repolarization two processes. When the ventricular muscle is stimulated, the resting potential of the membrane decreases (negative value decreases). When the threshold potential is reached (approximately -70 mV), the “fast channel” on the cell membrane is activated and opened, and the extracellular membrane sodium rapidly flows into the membrane Within the membrane potential rises sharply from negative to positive, this process is called depolarization (0). Myocardial cell depolarization, due to intracellular metabolic processes, the cell membrane to restore the permeability of potassium and sodium ions, the cells gradually restored from the positive potential to the resting membrane potential level, the process is called repolarization. Repolarization early fast