Which component of blood is water a major part of?

Water is a major component of plasma, which is the liquid part of blood. Plasma accounts for about 55% of total blood volume, and it is primarily composed of approximately 90% water. This high water content is crucial because it serves as a solvent and medium for many substances in the blood, including nutrients, hormones, waste products, and proteins. The water in plasma helps maintain blood pressure and blood volume, facilitates the movement of substances throughout the body, and plays a critical role in thermoregulation and maintaining homeostasis.