Blood Pressure

Topics: Blood pressure, Blood, Vasopressin Pages: 3 (719 words) Published: February 9, 2013
Hormones can react to increase blood pressure when it becomes low, the sympathetic division of the autonomic nervous system uses several ways to temporarily increase blood pressure when it has dropped for example during the fight or flight response. During the response, the sympathetic division is needed to stimulate the adrenal glands to release the hormones epinephrine and norepineprine which stimulate the heart to beat faster and for blood to flow more forcefully, this effect makes most of the arterioles to constrict and some arterioles dilate, which leads to an increase blood supply where needed. In order to increase blood it is vital for the sympathetic division to get the kidneys to decrease their secretion of salt and water; this will mean an increase in blood volume and blood pressure then returns to normal. Blood pressure can be lowered by the actions of artrial natriutretic peptide (ANP) hormone. Atrial natrriuretic hormones are a protein and a vasodilator, which is released by heart muscle cells. The hormone is involved in maintaining the homeostatic control of water and sodium a constant. Cells in the atrial chamber of the heart release Atrial natriuretic when the body senses high blood pressure. The hormone acts to lower blood pressure by reducing the water and sodium levels in the circulatory system. This results in blood pressure being lowered. There are many pressure-controlling hormones. For instance, the kidneys control arterial pressure inducing changes in the volume of extra cellular fluids through the renin-angiotensin system. Renin is an enzyme released by the kidneys when the blood pressure is dangerously low. Renin helps to increase blood pressure through several ways. It promotes the release of angiotensin I, a mild vasoconstrictor, by entering the blood circulation. Angiotensin I is then enzymatic-ally processed to become angiotensin II, a powerful vasoconstrictor that acts mainly on the small arterioles, and in a lesser way on...
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