Bainbridge reflex

Bainbridge reflex

also called  atrial reflex 

      acceleration of the heart rate resulting from increased blood pressure in, or increased distension of, the large systemic veins (vein) and the right upper chamber of the heart. This reflex, first described by the British physiologist Francis Arthur Bainbridge in 1915, prevents the pooling of blood in the venous system.

      Special pressure sensors called baroreceptors (or venoatrial stretch receptors) located in the right atrium of the heart detect increases in the volume and pressure of blood returned to the heart. These receptors transmit information along the vagus nerve (10th cranial nerve) to the central nervous system (nervous system, human). This response results in the activation of sympathetic nerve pathways that serve to increase the strength of contraction of the heart muscle and to increase heart rate ( tachycardia). The Bainbridge reflex can be blocked by atropine, is diminished or absent when the initial heart rate is high, and can be abolished by cutting the vagus nerves.

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Look at other dictionaries:

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  • Bainbridge reflex — Bain·bridge reflex bān (.)brij n a homeostatic reflex mechanism that causes acceleration of heartbeat following the stimulation of local muscle spindles when blood pressure in the venae cavae and right atrium is increased Bainbridge Francis… …   Medical dictionary

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  • Bainbridge-Reflex — Bain|bridge Re|flex [be̱inbrids̶c̶h̶...; nach dem engl. Physiologen F.Bainbridge ReflexA. Bainbridge, 1874 1921]: reflektorische Beschleunigung des Herzschlags bei vermehrter Blutfülle in den herznahen Venen u. im rechten Herzvorhof (z. B.… …   Das Wörterbuch medizinischer Fachausdrücke

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  • Bainbridge — Francis A., English physiologist, 1874–1921. See B. reflex …   Medical dictionary

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