What percentage of plasma is made up of substances such as proteins, ions, and nutrients?

Plasma, the liquid component of blood, comprises about 55% of total blood volume, and it contains various substances, including proteins, electrolytes (ions), nutrients, hormones, and waste products. The solid components of blood, including red blood cells, white blood cells, and platelets, account for the remaining 45%.

In terms of the composition of plasma, proteins constitute a significant portion, approximately 7-8% of plasma, while other substances like ions and nutrients also add to this percentage but do not individually contribute large amounts. When considering all different components dissolved in plasma, the overall contribution from proteins and other solutes can be estimated to be around 10%. Therefore, the percentage of plasma that is made up of these substances is closest to this value, making the response that indicates 10% as the correct choice to reflect the composition accurately.