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Human blood is a remarkable fluid that plays a crucial role in sustaining life. Composed of red blood cells, white blood cells, platelets, and plasma, it performs essential functions in the body. Red blood cells carry oxygen from the lungs to tissues and organs, while also transporting carbon dioxide back for exhalation. White blood cells are vital for the immune response, defending against infections and diseases. Platelets help in clotting, preventing excessive bleeding when injuries occur. Plasma, the liquid component, is primarily water but also contains proteins, hormones, and nutrients. Blood is often referred to as the "river of life" due to its vital transportation role. The composition of blood can vary based on factors like age, gender, and health status. Blood types—A, B, AB, and O—are determined by the presence of specific antigens, making blood transfusions a critical consideration in medical settings.