What is the definition of plasma in the context of blood?

Plasma is defined as the liquid part of blood, serving as the medium in which various components of blood are suspended. This yellowish fluid constitutes about 55% of total blood volume and consists mainly of water but also contains proteins, electrolytes, nutrients, hormones, and waste products. Its primary functions include transporting these substances throughout the body, helping regulate body temperature, and maintaining blood pressure.

In the broader context of blood composition, the cells in blood, such as red blood cells, white blood cells, and platelets, float within the plasma. The correct understanding of plasma is essential for appreciating its role in facilitating numerous physiological processes and in clinical laboratory diagnostics, such as when analyzing blood samples to assess health or diagnose disease.