Which of the following is true regarding the composition of blood?

Blood composition is made up of approximately 55% plasma and 45% formed elements, which include red blood cells, white blood cells, and platelets. Plasma, the liquid component of blood, serves as a medium for transporting nutrients, hormones, and waste products, while the formed elements play critical roles in oxygen transport, immune response, and blood clotting.

Understanding the accurate proportions is important in physiology because variations in these percentages can affect overall health and indicate different pathological conditions. For example, an increase or decrease in the proportion of plasma or formed elements might signal dehydration or disorders like anemia. Keeping this standard composition in mind is essential when studying blood functions and related physiological mechanisms.