What percentage of blood is composed of plasma?

The composition of blood includes both cellular components and plasma, which is the liquid portion of blood. Plasma is known to make up approximately 55% of the total blood volume in a healthy adult. It is essential for transporting nutrients, hormones, waste products, and proteins throughout the body.

This 55% figure encompasses various components, such as water, electrolytes, proteins, and hormones, all of which play critical roles in maintaining homeostasis and facilitating bodily functions. The remaining percentage of blood volume consists mainly of red blood cells, white blood cells, and platelets, which together are classified as formed elements.

Understanding the composition of blood and the role of plasma is critical for various areas in biomedical science, including hematology and physiology. Recognizing that plasma constitutes around 55% of blood serves as a foundational knowledge point for students and professionals in the healthcare field.