Final answer:
Water is the most abundant component of plasma, making up about 92 percent of its volume, with the remaining 8 percent consisting of proteins, electrolytes, and other substances.
Step-by-step explanation:
The most abundant component of plasma is water. Plasma, which comprises about 55 percent of blood by volume, is approximately 92 percent water. While plasma also contains proteins—such as albumin, the most abundant plasma protein, globulins, and regulatory proteins—as well as various electrolytes, dissolved gases, organic nutrients, and metabolic wastes, these substances combined make up the remaining 8 percent of plasma's composition. In particular, plasma proteins account for about 7 percent of the volume of plasma. The role of water in plasma is crucial as it serves as a solvent and suspension medium for these various components, facilitating their transport throughout the body.