👉 Rapid fluid, often referred to as blood, is a complex and dynamic biological fluid that circulates throughout the body. It's primarily composed of water, but also contains red blood cells, white blood cells, platelets, proteins, and various other substances like salts, sugars, and hormones. This fluid serves multiple critical functions: transporting oxygen and nutrients to cells, removing waste products, regulating body temperature, and playing a key role in immune responses. Its rapid circulation ensures that cells receive the necessary resources for survival and function, while also facilitating quick responses to injuries or infections.