Pressure in arteries raises for the different reasons. In one case heart is reduced more strongly, throwing out a lot of blood, in other large arteries lose normal elasticity, become rigid and cannot extend, when heart throws out in them blood. Thus, blood at each intimate reduction passes through smaller, than in norm, a gleam of a vessel, and pressure increases.
It is often observed at older persons as at them walls of arteries become СѓС‚РѕР»С‰РµРЅРЅС‹РјРё and rigid because of development of an atherosclerosis. Arterial pressure increases Hypertension symptoms
for the same reason at when fine arteries () are narrowed as a result of stimulation by nervous impulses or hormones in blood. The third reason of increase of pressure in arteries - increase in quantity of a liquid which circulates in blood system.
Such happens, when the damaged kidneys not in a condition to remove enough salt also waters from an organism. The volume of blood in an organism increases, hence, arterial pressure increases. And on the contrary, when pump function of heart decreases Hypertension symptoms
, arteries are expanded or liquids in system of blood circulation insufficiently, pressure falls. These factors depend on changes of function of kidneys and in independent nervous system - that part of nervous system which automatically adjusts many functions of an organism.
The sympathetic nervous system, being a part of independent nervous system, temporarily increases arterial pressure during reaction « struggle or flight » (physical reaction of an organism to stress). The sympathetic nervous system increases frequency and force of intimate reductions. It also narrows the majority Hypertension symptoms, but in some fabrics, for example in skeletal muscles where the increased blood supply is necessary, on the contrary, expands them. Besides the sympathetic nervous system reduces deducing by kidneys of salt and water, thus increasing volume of blood in an organism. The sympathetic nervous system also gives a signal to emission of hormones of adrenaline and which stimulate heart and blood vessels.
Kidneys operate arterial pressure in several ways. If arterial pressure raises, kidneys increase deducing salt also waters that reduces volume of blood and normalizes arterial pressure. On the contrary, if arterial pressure decreases, kidneys reduce deducing salt also waters, there is an increase in volume of blood, and arterial pressure comes back to norm. Kidneys can raise arterial pressure and due to development of the enzyme named Hypertension symptoms. It stimulates development of a hormone of angiotensin, and that causes emission of a hormone.
As kidneys play the important role in regulation of the arterial pressure, many Hypertension symptoms illnesses are capable to cause its increase. For example, cause increase of pressure narrowing the artery supplying one kidneys (a stenosis arteries) can. An inflammation of kidneys and traumas of one or both kidneys also can become factors of increase of arterial pressure.
Greater role in regulation of arterial pressure the system plays fabric, that is local, renin-angiotensin- which basic components are developed not in kidneys, and in walls of vessels and a muscle of heart.
What the reason led to change of arterial pressure, are started РєРѕРјРїРµРЅСЃР°С‚РѕСЂРЅС‹Рµ mechanisms which are called to counteract it and to support pressure at normal levels. For example, the increase in volume of the blood thrown out by heart, leading increase of arterial pressure, causes expansion of blood vessels, and also the strengthened deducing salt also waters through kidneys, that in turn helps to reduce arterial pressure. However the atherosclerosis does arteries rigid and interferes with expansion of vessels which lowers arterial pressure (Hypertension symptoms) and normalizes it. Atherosclerotic changes of kidneys can break their ability to deduce salt and water that conducts to increase of pressure.
NEWS and PUBLICITY
ALCOHOL The regular use of spirits, as is known, lifts a blood pressure, but the effect can depend substantially on age and levels of cholesterol in an organism of the person, has shown research of medical college Hyogo in Japan.
ARTERIAL HYPERTENSION Except for arterial hypertension is at us and such not palatable illness, as a pulmonary hypertension. As the arterial hypertension in view of the mass character has got character of national disaster, it is included in the National program.
HYPERTENSION The very first classification of a hypertension belongs to German doctor Frantsu Folhardu, which else in 1914 has started to subdivide it on red and pale. Here such then there was a primitive attitude to this artful illness.
ARTERIAL HYPERTENSION Arterial hypertension is artful that at an initial stage almost has no symptoms. The diagnosis is established at steady arterial pressure of 140/90 mm hg. Though doctors consider, that pressure of 130/80 mm hg already should be considered guarding