What percentage of plasma is composed of water?

Plasma, which is the liquid component of blood, is primarily composed of water, making up about 90% of its total volume. This high percentage is crucial because water serves as a solvent for carrying various substances around the body, including nutrients, hormones, and waste products. Additionally, the water in plasma plays a vital role in maintaining blood pressure and temperature, as well as transporting cells and proteins. The other components of plasma, which include proteins, electrolytes, hormones, and waste products, constitute the remaining 10%. Understanding the composition of plasma is essential for phlebotomy technicians, as it highlights the importance of water in overall blood functionality and health.