What percentage of human blood consists of water?

Human blood is composed of approximately 91.5% water, which is a crucial component of the plasma that makes up a significant portion of blood. Plasma itself accounts for about 55% of total blood volume, and the high water content is essential for maintaining blood volume, transporting nutrients and hormones, and regulating body temperature. The water in blood also helps facilitate the movement of red blood cells, white blood cells, and platelets, among other components.

This high percentage of water plays a vital role in the physiological functions of the circulatory system. It contributes to the fluidity of blood, allowing for efficient flow through blood vessels and ensuring that oxygen and nutrients are effectively delivered to tissues while waste products are removed.