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In page Heyde's syndrome:
"Von Willebrand factor is synthesized in the walls of the blood vessels and circulates freely in the blood in a folded form. When it encounters damage to the wall of a blood vessel, particularly in situations of high velocity blood flow, it binds to the collagen beneath the damaged endothelium and uncoils into its active form. Platelets are attracted to this activated form of von Willebrand factor and they accumulate and block the damaged area, preventing bleeding[citation needed].
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