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Everyone has been injured and seen gallons of blood flow in movies or TV series! But who really knows what's in blood? 0:00 - Introduction 0:25 Level 1 - Blood circulation and functions 0:56 Level 2 - Plasma and formed elements (RBCs, GBs and platelets) 1:52 Level 3 - Details on formed elements (erythrocytes, leukocytes, thrombocytes) 4:30 Level 4 - Formation of formed elements in the bone marrow 5:35 - To summarize 6:10 - End Details: Plasma contains serum and clotting agents. Once the coagulants and fibrin have been eliminated, this liquid is called serum. In the video, it is fibrinogen. Info: In the photographs, the white blood cells appear purple because of the staining method used. Sources: The immune system, by Peter PARHAM, at De Boeck. Biology, by RAVEN, at De Boeck. hematocell.fr histology.be futura-sciences.com donnersonsang.com Illustrations: bigstockphoto.fr Servier Medical Art: Blood and immunology