Submitted by scoliendo t3_ycx8eo in askscience
ExtraVacation t1_itq4ejc wrote
Consider the inflamatory process. Lets say a nail punctured your skin- there will be a brief vasoconstriction, then mast cells degranulate releasing histammine, prostaglandins, etc. Histamine is a major player in vasodiolation with the purpose of increasing blood flow to that LOCALIZED area-- with this increased flow includes clotting factors too. So widespread vasocinstriction would indeed raise blood presure, but when localized to capilary bed wouldn't have any meaningful impact on BP.
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