Catecholamines these vessels autoregulate other

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Unformatted text preview: by the SNS or catecholamines These vessels autoregulate Other Chemicals That Increase Blood Pressure Antidiuretic hormone (ADH) – causes intense vasoconstriction in cases of extremely low BP Angiotensin II – causes intense vasoconstriction when renal perfusion is inadequate Aldosterone-retains water and increases blood volume Hormonal control of blood pressure-Anti-diuretic hormone Antidiuretic hormone (ADH). This hormone is produced by the hypothalamus and released from the posterior pituitary when blood loss is severe, and blood pressure is reduced. ADH causes widespread vasoconstriction. Hormonal control of blood pressureAngiotensin II Angiotensin II is one of the most powerful vasoconstrictor substances known It usually acts on all arterioles simultaneously when it is released into the blood The result is an increase in vascular resistance when blood pressure is too low Low blood pressure results in the release of renin by the kidney; angiotensinogen converts renin into angiotensin I, and the lungs convert AT I into AT II by angiotensin converting enzyme, which is located in the endothelial cells of the lung Hormonal control of blood pressure-Aldoster...
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This note was uploaded on 01/30/2010 for the course PSIO 202 taught by Professor Staff during the Spring '08 term at University of Arizona- Tucson.

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