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It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles. [2] Blood vessel walls are composed of endothelial tissue and a basal membrane lining the lumen of the vessel, concentric smooth muscle layers on top of endothelial tissue, and an adventitia over ...
Diabetic nephropathy is the most common cause of end-stage renal disease and is a serious complication that affects approximately one quarter of adults with diabetes in the United States. [ 13 ] [ 14 ] Affected individuals with end-stage kidney disease often require hemodialysis and eventually kidney transplantation to replace the failed kidney ...
It is associated with aging, hypertension, diabetes mellitus, [5] dementia, [6] and may be seen in response to certain drugs (calcineurin inhibitors). [7] It is often seen in the context of kidney pathology. [4] [8] [9] In hypertension only the afferent arteriole is affected, while in diabetes mellitus, both the afferent and efferent arteriole ...
When renal blood flow is reduced (indicating hypotension) or there is a decrease in sodium or chloride ion concentration, the macula densa of the distal tubule releases prostaglandins (mainly PGI2 and PGE2) and nitric oxide, which cause the juxtaglomerular cells lining the afferent arterioles to release renin, activating the renin–angiotensin–aldosterone system, to increase blood pressure ...
The muscle tension in the afferent arteriole is modified based on the difference between the sensed concentration and a target concentration. [5] Vasodilation of the afferent arteriole, which results in increased glomerular filtration pressure and tubular fluid flow, occurs when MD cells detect a chloride concentration that is below a target value.
When blood pressure is increased in the blood vessels and the blood vessels distend, they react with a constriction; this is the Bayliss effect. Stretch of the muscle membrane opens a stretch-activated ion channel. The cells then become depolarized and this results in a Ca 2+ signal and triggers muscle contraction. No action potential is ...
An arteriole is a small-diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries. [1] Arterioles have muscular walls (usually only one to two layers of smooth muscle cells) and are the primary site of vascular resistance. The greatest change in blood pressure and velocity of blood flow ...
This results suggests that this peripheral test reflects the physiology of the coronary endothelium. Since NO maintains low tone and high compliance of the small arteries at rest, [ 22 ] a reduction of age-dependent small artery compliance is a marker for endothelial dysfunction that is associated with both functional and structural changes in ...
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