Why is the sea water not drinkable?

Living cells do depend on sodium chloride (salt) to maintain the body's chemical balances and reactions; however, too much sodium can be deadly. Human kidneys can only make urine that is less salty than salt water. read more

This all has to do with the process of osmosis in the body’s cells. Osmosis governs the spontaneous net movement of molecules across a membrane to balance the concentrations of both molecules in the solutions. read more

Seawater is toxic because your body fails eventually when it has to try to get rid of the salt that comes from sea water. Your body normally gets rid of excess salt by having the kidneys produce urine, but it needs freshwater to dilute the salt in your body for the kidneys to work properly. read more