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Hypertension: High Blood Pressure

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Hypertension also is known as High Blood Pressure is a chronic disease where the pressure of the blood in the arteries of the heart is continually elevated. Hypertension begins when the blood in the small vessels (arteries) in the body become narrow and causes the blood in those vessels to pressurize against the walls of the arteries. It causes the heart to work harder to keep up with the pressure and the heart to become weaker over time. Over time the weak heart can cause trouble to the other organs such as the brain, eyes or kidneys. Hypertension can be started due to a disease in the kidneys in some people. The normal rating of the blood pressure can be above 120 over 80 and less than 140 over 90. Hypertension can be a life-threatening …show more content…
For blood pressure to increase, the heart pumps blood more quickly, the arteries (arterioles) constricts, and the volume of blood increases. Likewise, for blood pressure to decrease, the heart pumps more slowly, the arteries dilate, and the volume of blood decreases. These functions are maintained by the sympathetic nervous system (part of the automatic nervous system) and the kidneys. The way the sympathetic nervous system increases blood pressure is by releasing epinephrine and norepinephrine, which makes the heart pump faster as well as dilating (for areas in need of blood supply) or constructing (for areas that do not need much blood supply) various arterioles. The sympathetic nervous system also stimulates the kidney to keep more salt and water in the body, increasing the blood volume and the blood pressure. As for the kidneys, it maintains homeostasis based on the blood pressure via the renin-angiotensin-aldosterone system, a chain of reactions that help maintain blood pressure levels. When the blood pressure gets too high, the kidney eliminates salt and water, which decreases blood volume. When the blood pressure gets too low, the kidney keeps the salt and water in the body, increasing blood volume. When increasing blood pressure, the kidneys secrete renin, an enzyme designed to produce the hormones that controls the blood pressure. Upon release, renin splits a large protein called angiotensinogen, into various parts. One of the parts, angiotensin I, is further split by an angiotensin-converting enzyme (ACE) into angiotensin II. Angiotensin II is a hormone that increases blood pressure by constricting the arterioles via the sympathetic division and the release of the hormones, aldosterone from the adrenal gland and antidiuretic hormone (vasopressin) from the pituitary gland. Aldosterone helps the kidneys keep the salt and water in the

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