Drainage from wounds.
Suctions from stomach.
Transports nutrients in the blood stream.
Regulates our body temperature
Helps the brain to produce hormones and neurotransmitters.
Help cells such as those in the heart to maintain voltage.
Carry electrical impulses across cells such as those in muscles.
Make sport drinks such as Gatorade taste sweeter and better.
Kidney problems such as dialysis
Heart problems such as Congestive Heart Failure
Adrenal gland disorders
Low levels of sodium ie. Hyponatremia
Here's an interesting quiz for you.