The Components and Functions of Blood

The video explains that the human body contains about five liters of blood, which appears red but is composed of various elements. Under a microscope, blood reveals plasma, red blood cells, white blood cells, and platelets. Plasma, mostly water, carries essential substances like vitamins and minerals. Red blood cells transport oxygen, while white blood cells fight infections. Platelets, cell fragments, play a crucial role in clotting to stop bleeding by forming a net over injuries.

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