When cells are damaged, they release chemicals which:     cause capillaries to constrict     cause capillaries to dilate     cause veins to drain blood from the area faster than usual     cause the number of macrophages in the body to decrease

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Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.