第三节细胞的生物电现象thebioelectricphenomenaofcell21.ppt

第三节 细胞的生物电现象The Bioelectric Phenomena of Cell ;概述;一、细胞的静息电位及其产生机制 Resting potential of cell and its mechanism ;△ 产生条件： ①细胞膜内外的离子分布不均匀。 ②细胞膜对离子的通透性不同。 △ 产生机理 ①在静息状态下，钾通道开放，膜对K+的通透性较高。 ②由于膜内的K+浓度高于膜外，K+顺浓度差扩散膜外。;;二、细胞的动作电位及其产生机制 Action potential of cell and its mechanism;(二)动作电位产生机制;2. 动作电位的产生;3. 动作电位的传导;4.神经干的动作电位;三、组织的兴奋和兴奋性 excitation and excitability of tissue;△ 反应的形式 ;(二) 刺激引起兴奋的条件;(三)细胞兴奋后的兴奋性改变;第四节 肌细胞收缩功能The Contraction of Muscle Cell ;一、神经-骨骼肌接头处兴奋的传递(The transmission on neuromuscular junction) ;二、骨骼肌细胞的微细结构(The micro-organization of skeletal muscle cell) ;肌原纤维 肌小节： 1/2明带 暗带 1/2明带 ;肌丝排列;（二）肌管系统; 横 纵管 管 ;(三)骨骼肌的收缩机制和兴奋-收缩耦联;;;;动作电位波形;兴奋的周期变化;RfOcL9H6E3B+y(u%r#oWlTiQeNbJ8G5D1A-x*t$qYnVkSgPdMaI7F3C0z)vs!pXmUiRfOcK9H6E2B+y(u%rZoWlThQeNbJ8G4D1A-w*t$qYnVjSgPdLaI7F3C0y)vs#pXmUiRfNcK9H5E2B+x(u$rZoWkThQeMbJ7G4D1z-w*t!qYnVjSgOdLaI6F3C0y)v%s#pXlUiRfNcK8H5E2A+x(u$rZnWkThPeMbJ7G4C1z-wt!qYmVjRgOdL9I6F3B0y(v%s#oXlUiQfNcK8H5D2A+x*u$rZnWkShPeMaJ7G4C1z)wt!pYmVjRgOcL9I6E3B0y(v%r#oXlTiQfNbK8G5D2A-x*u$qZnVkShPdMaJ7F4C0z)ws!pYmUjRgOcL9H6E3B+y(v%r#oWlTiQeNbK8G5D1A-x*t$qZnVkSgPdMaI7F4C0z)vs!pXmUjRfOcK9H6E2B+y(u%rZoWlThQeNbJ8G5D1A-w*t$qYnVkSgPdLaI7F3C0z)vs#pXmUiRfOcK9H5E2B+x(u%rZoWkThQeMbJ8G4D1z-w*t!qYnVjSgOdLaI6F3C0y)v%s#pXlUiRfNcG5D1A-w*t$qYnVkSgPdLaI7F3C0z)vs#pXmUiRfOcK9H5E2B+x(u%rZoWkThQeMbJ8G4D1z-w*t!qYnVjSgPdLaI6F3C0y)vs#pXlUiRfNcK9H5E2A+x(u$rZoWkThPeMbJ7G4D1z-wt!qYmVjSgOdL9I6F3B0y)v%s#oXlUiQfNcK8H5E2A+x*u$rZnWkThPeMaJ7G4C1z-wt!pYmVjRgOdL9I6E3B0y(v%s#oXlTiQfNbK8H5D2A-x*u$qZnWkShPdMaJ7F4C1z)ws!pYmUjRgOcL9I6E3B+y(v%r#oXlTiQeNbK8G5D2A-x*t$qZnVkShPdMaI7F4C0z)ws!pXmUjRfOcL9H6E2B+y(u%r#oWlThQeNbJ8G5D1A-x*t$qYnVkSgPdMaI7F3C0z)vs!pXmUiRfOcK9H6E2B+x(u%rZoWlThQeMbJ8G4D1A-w*t!qYnVjSgPdLaI6F3C0y)vs#pXlUiRfNcK9H5E2B+x(u$rZoWkThQeMbJ7G4D1z-w*t!qYmVjSgOdLaI6F3B0y)v%s#pXlUiQfNcK8H5E2A+x*u$rZnWkThPeMaJ7G4C1z-wt!qYmVjRgOdL9I6F3B0y(v%s#oXlUiQfNbK8Hz-w*t!qYmVjSgOdLaI6F3B0y)v%s#