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Why does blood coagulate when it comes outside the body but does not coagulate inside the body?

April 26, 2017blood body coagulate comes outside

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Why does blood coagulate when it comes outside the body but does not coagulate inside the body?

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Secretion of heparin by WBC inside the body prevents blood coagulation. But when tissues are wounded resulting in bleeding, a series of reactions takes place in the bled blood which ultimately forms a fine mesh of hard fibre within which the blood cells are trapped and the blood is thus clotted.