What is the primary role of plasma in the blood?

The primary role of plasma in the blood involves several critical functions, with one of its key responsibilities being the transportation of carbon dioxide (CO2) and the dilution of toxins. Plasma, which constitutes about 55% of total blood volume, is a yellowish liquid that serves as a medium for various components of blood, including cells, nutrients, hormones, and wastes.

In particular, plasma plays a vital role in the transport of metabolic waste products like carbon dioxide from tissues back to the lungs, where it can be exhaled. This is essential for maintaining proper acid-base balance in the body and facilitating efficient gas exchange in the respiratory process. Additionally, it helps in diluting and transporting toxins that may be produced by cellular metabolism or introduced into the body, enabling their elimination via the liver or kidneys.

While plasma does contribute to body temperature regulation and has roles in immunity, these are secondary functions compared to its primary role in transportation, particularly regarding gaseous exchange and waste management. This understanding underscores the importance of plasma as a versatile component essential for maintaining homeostasis in the body.