What is the primary role of plasma in the body?

The primary role of plasma in the body is to transport nutrients, hormones, and waste products. Plasma is the liquid component of blood, making up about 55% of its total volume. It serves as a crucial medium that facilitates the movement of various substances throughout the body. This includes not only nutrients absorbed from the digestive system, but also hormones secreted by glands that regulate numerous physiological processes. Additionally, plasma is responsible for transporting waste products from the cells to the organs that eliminate them, such as the kidneys and liver.

In contrast, while plasma does play roles in coagulation and other functions, its foremost purpose is to serve as a transport medium. Other components of blood, such as red blood cells, are specifically tasked with transporting oxygen. Thus, while all of these functions are important, the predominant role of plasma is its function in the transportation of essential substances.