What percentage of whole blood is made up of plasma?

Plasma constitutes approximately 55% of whole blood. This percentage indicates the volume of blood that is not filled with cells, such as red blood cells, white blood cells, and platelets. Plasma is primarily composed of water, but it also contains proteins, electrolytes, nutrients, hormones, and waste products, which are vital for various physiological functions, including transport and regulation of body temperature.

Understanding that plasma makes up the majority of blood components helps in recognizing its essential role in maintaining homeostasis and ensuring proper functionality of the circulatory system.