What percentage of whole blood is made up of plasma?

• A. 60%
• B. 55%
• C. 50%
• D. 45%

Answer: (B)

Plasma constitutes a significant portion of whole blood, and the correct percentage is approximately 55%. Plasma is the liquid component of blood, serving as a medium for transporting cells, nutrients, hormones, carbon dioxide, and other substances throughout the body. It's important to note that plasma is crucial for maintaining blood pressure and volume, as well as for playing roles in immune responses and blood clotting.

The other options reflect percentages that do not accurately depict the composition of whole blood. For example, while 60% might seem close, it overestimates the proportion of plasma in relation to the total blood volume. The figures of 50% and 45% are also lower than the established percentage of plasma in whole blood. Understanding this composition is essential for grasping how various components of blood function and interact within the circulatory system, particularly in the context of medical studies and treatments involving blood.