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Transient vasoconstriction occurs immediately after injury followed by vasodilation. The vasoconstricion is the bodies defence against blood loss, but after this threat is passed the chemical mediators signal the vessles to dilate to allow platlets to get to the area via blood so that a clot can form. the acute inflammation occurs after the vasoconstriction, and with the vasodilation because the blood vessles also become more permeable allowing more fluid into the surrounding area. Increased fluid = inflammation.

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14y ago

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