The main reason why the Supreme Court case Marbury v. Madison was significant is because B. it established the power of judicial review, since this allows the Supreme Court to check the legislature. This question is archived.
Water: Why We Need It. Hydration is important because the body is comprised mostly of water, and the proper balance between water and electrolytes in our bodies really determines how most of our systems function, including nerves and muscles, says Larry Kenney, PhD, a professor of physiology and kinesiology at Penn State.
Potassium, sodium and other electrolytes dissolve in water and help carry an electrical charge. The cells in your body need electrolytes to transport and maintain electrical impulses. The sodium-potassium pump describes a mechanism in which sodium and potassium ions move in and out of your cells. Each time this happens, an electrical charge is produced.