Final answer:
The negative ion important for nerve impulse transmission and fluid regulation is chloride
Step-by-step explanation:
The negative ion that is important for both nerve impulse transmission and fluid regulation in the body is
chloride (Cl-).
Chloride ions play a crucial role in maintaining the proper balance of fluids within cells and organs, as well as in transmitting electrical signals in the nervous system.
Learn more about Chloride and its role in nerve impulse transmission and fluid regulation