Understanding the percentage of plasma in blood helps explain how the circulatory system supports life, maintains internal balance, and responds to injury or disease. This liquid component forms the medium that carries cells, nutrients, hormones, and protective proteins throughout the

Understanding how human circulation works plays a critical role in saving lives, especially during emergencies, surgeries, and transfusion procedures (World Health Organization). One concept that often raises questions is the universal blood group. This term directly relates to how RBCs