👉 Flight fluid, also known as blood plasma or serum, is the liquid component of blood that makes up about 55% of its total volume. It plays a crucial role in the circulatory system, serving as a medium to transport nutrients, hormones, and waste products throughout the body while also carrying oxygen and carbon dioxide in the form of hemoglobin. Composed primarily of water, proteins, electrolytes, and various dissolved substances, flight fluid facilitates essential physiological processes such as maintaining blood volume, regulating body temperature, and supporting immune function. Its fluid nature enables it to flow freely through blood vessels, ensuring efficient distribution of vital substances and removal of metabolic byproducts.