By threatening the vitality of a tissue
(2) Irritants. Heat and cold, chemical or mechanical. Any of these, by threatening the vitality of a tissue, induce immediately an augmented flow of blood to the part to furnish the means of repair a hot iron, frostbites, acids, or a blow.
(3) Nerve influence. This may produce congestion either by acting on the part reflexly or as the result of some central nerve disturbance affecting the branch which supplies a given organ.
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