5.功能(function) 冬参与细胞代谢(Promoting the cell metabolism) 必维持细胞膜静息电位 (Maintenance of the resting membrane potential) 必调节渗透压和酸碱平衡 (Regulating the osmotic pressure and acid-base balance)5. 功能(function) function) ™参与细胞代谢(Promoting Promoting the cell metabolism) the cell metabolism) ™维持细胞膜静息电位 维持细胞膜静息电位 (Maintenance of the resting Maintenance of the resting membrane potential) membrane potential) ™调节渗透压和酸碱平衡 调节渗透压和酸碱平衡 (Regulating the osmotic pressure Regulating the osmotic pressure and acid and acid-base balance) base balance)