What component does not belong to the formed elements of blood?

The formed elements of blood include the cellular components that are present in blood, which are primarily red blood cells, white blood cells, and platelets. These elements are responsible for various functions such as transporting oxygen, defending against infection, and aiding in blood clotting.

Plasma, on the other hand, is the liquid component of blood, which makes up about 55% of its volume. It consists of water, electrolytes, proteins, hormones, and waste products, serving as a medium for transporting the formed elements and various substances throughout the body. Therefore, plasma does not belong to the formed elements, as it is not a cellular component but rather the fluid portion of blood that supports the function of these elements. Understanding this distinction is key to grasping the composition of blood and its various roles in the body.