active hyperemia

hyperemia /hy·per·emia/ (-e´me-ah) engorgement; an excess of blood in a part.hypere´mic

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active hyperemia , arterial hyperemia that due to local or general relaxation of arterioles.

exercise hyperemia  vasodilation of the capillaries in muscles in response to the onset of exercise, proportionate to the force of the muscular contractions.

passive hyperemia  that due to obstruction to flow of blood from the area.

reactive hyperemia  that due to increase in blood flow after its temporary interruption.

venous hyperemia  passive h.

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active hyperemia

n.

Hyperemia due to increased flow of arterial blood in dilated capillaries. Also called arterial hyperemia, fluxionary hyperemia.

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active hyperemia

Etymology: L, activus + Gk, hyper, excessive, haima, blood

the increased flow of blood into a particular body part, caused by an increase in vasoactive metabolites. It is associated with increased metabolism.

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hyperemia (hī´prē´mē),

n an increased and excessive amount of blood in a tissue. The hyperemia may be active or passive.

hyperemia, active,

n a type caused by an increased flow of blood to an area by active dilation of both the arterioles and capillaries. It is associated with neurogenic, hormonal, and metabolic function.

hyperemia, passive,

n a type caused by a decreased outflow of blood from an area. It may be generalized, resulting from cardiac, renal, or pulmonary disorders, or it may be localized, as in the oral cavity, and caused by pressure from mechanical or physical obstruction or by pressure from a tumor, denture, filling, or salivary calculus.

hyperemia, pulpal

n a condition in which an injury, infection, or irritant causes the blood vessels around the tooth's pulp to dilate, resulting in painful pressure.