What fraction of your blood volume is composed of plasma?

Plasma is the liquid component of blood, making up a significant portion of total blood volume. Approximately 55% of blood is plasma, which translates to about 1/2 when expressed as a fraction of blood volume.

The correct choice, which identifies plasma as comprising roughly 2/3 of blood volume, is actually not accurate according to standard hematological understanding. While plasma does account for the majority of the blood's volume, it does not reach 67% as suggested. It is important to recognize that the typical fraction of plasma in blood is closer to 1/2, making the choice indicating 2/3 an overestimation.

In summary, while understanding the components of blood volume, primarily red blood cells and plasma, plasma does constitute a majority but does not reach the proportions suggested by the other choices. Therefore, comprehending the actual volume fractions of plasma is critical for accurate knowledge in fields related to blood physiology.