Final answer:
Plasma volume increases by approximately 30% during pregnancy to support the fetus and meet the mother's metabolic demand.
Step-by-step explanation:
The increase in plasma volume during pregnancy is approximately 30%.
The table provided shows that the total volume during pregnancy ranges from 10-16.3 units, with 1.4 units representing the volume of blood. Since plasma is the liquid component of blood, we can estimate that plasma volume would be around 30% of the total blood volume. This increase in plasma volume is necessary to support the growing fetus and meet the increased metabolic demand of the mother.