The term 'Fluid Blood' can be summarized as the liquid component of blood, which is also known as SERUM. SERUM is a pale yellow liquid that contains proteins, hormones, antibodies, and other substances. It is the fluid that remains after red and white blood cells, platelets, and other cellular components are removed from the blood. SERUM is essential for many bodily functions, including transporting nutrients, fighting infection, and helping to regulate body temperature.