分离出的单个外毛细胞在５．３６ｍｍｏｌ／Ｌ钾含量的Ｈａｎｋ平衡盐液（ＨＢＳＳ）中，观察３０分钟无明显形态改变。高钾环境（１２５ｍｍｏｌ／Ｌ）里，外毛细胞会发生沿纵轴方向的收缩运动，钾可引起外毛细胞去极化，通过电压依赖钙通道而升高细胞内的钙含量。用Ｖｅｒａｐａｍｉｌ阻断钙通道或以无钙的溶液灌注，外毛细胞在高钾环境中依然发生持续性收缩反应。实验表明：钾去极化引起外毛细胞的收缩反应很有可能是电渗性收缩，这种收缩不依赖钙和收缩蛋白。 Isolated single outer hair cells in Hanks balanced salt solution (HBSS) with a potassium content of 5.36mmol / L, no significant morphological changes observed for 30 minutes. In high-potassium environment (125 mmol / L), outer hair cells undergo contraction along the longitudinal axis. Potassium can cause depolarization of outer hair cells and increase intracellular calcium content by voltage-dependent calcium channels. With Verapamil blocking calcium channels or calcium-free perfusion, outer hair cells in the high-potassium environment continued to occur in the contraction. Experiments show that: Potassium depolarization induced contraction of outer hair cells is likely to be contractile, this contraction is not dependent on calcium and contractile proteins.