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Blood is a vital fluid in the human body, responsible for transporting oxygen, nutrients, and waste products to and from cells. Composed of red blood cells, white blood cells, platelets, and plasma, it plays a critical role in immune response, clotting, and overall bodily function. Red blood cells carry oxygen, while white blood cells defend against infections. Platelets aid in clotting to prevent excessive bleeding, and plasma, the liquid portion, contains essential proteins and nutrients. Blood types, classified as A, B, AB, and O, are important for safe transfusions. Regular blood donations help save lives by providing resources for medical emergencies.