What is thr fluid part of the circulatory system?

The fluid part of the circulatory system is blood, which consists of plasma, red blood cells, white blood cells, and platelets. Plasma, the liquid portion, is primarily composed of water, electrolytes, proteins, hormones, and waste products, serving as a medium for transporting nutrients, gases, and waste throughout the body. It plays a crucial role in maintaining blood pressure and regulating body temperature.