👉 The fluid, or blood, is a complex mixture of cells and substances circulating within the circulatory system. Primarily composed of water, it contains red blood cells that transport oxygen and carbon dioxide, white blood cells that fight infections, platelets essential for clotting, and plasma, a liquid matrix rich in proteins, glucose, electrolytes, and waste products. This intricate fluid acts as the body's transportation network, delivering nutrients to tissues, removing waste, and regulating temperature, ultimately ensuring the proper functioning of every organ and system.