Final answer:
The human blood is composed about 55% of blood plasma and 45% of blood cells. These percentages can slightly vary due to different factors.
Step-by-step explanation:
The human blood is composed of both blood cells and blood plasma. Roughly, the percentage of blood plasma in the human body is around 55%, while the blood cells constitute around 45% of the total blood volume. It's important to note, however, that these percentages can fluctuate slightly due to various factors such as hydration levels and health conditions.
Learn more about Composition of Blood