Orthostatic reaction

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Orthostatic reaction is the organism's reflex reaction to orthostatic hypotension - a decrease in blood pressure due to the change in position from lying down to standing. It is mediated by the baroreflex. A decrease in blood pressure causes a decrease in the activity of baroreceptors in the sinus caroticus and arcus aortae, which leads to parasympathetic inhibition and a decrease in sympathetic inhibition. This results in vasoconstriction, increased heart rate and contractility[1].


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  1. GUYTON, Arthur C – HALL, John E. Textbook of Medical Physiology. 11. edition. Elsevier, 2006. pp. 782–784. ISBN 978-0-7216-0240-0.