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15 maj 2018 · An increase in output valve (valve 2) resistance (open less than midposition) resulted in an increased in filtered volume, a decrease in total flow, and an increase in filtration fraction. This represented the effect of efferent arteriolar constriction.
17 lip 2023 · Angiotensin II normally constricts the efferent arteriole, so ACE inhibitors (or angiotensin receptor blockers) dilate the afferent arteriole. Note that endogenously produced compounds (PGE2 and Angiotensin II) increase the GFR, and exogenous medications decrease the GFR (NSAIDS and ACEi or ARBs).
13 sty 2023 · Afferent and efferent arterioles transport blood in and out of the glomerulus. Hypovolemia-induced reduction in glomerular filtration leads to decreased flow of NaCl to specialized epithelial cells (macula densa). This, in turn, sends signals to the adjacent afferent arteriole to vasodilate and increase glomerular filtration.
Vasodilation in the afferent arteriole and vasconstriction in the efferent arteriole will increase blood flow (and hydrostatic pressure) in the glomerulus and will increase GFR. Conversely, vasoconstriction in the afferent arteriole and vasodilation in the efferent arteriole will decrease GFR.
21 cze 2024 · During exhalation, when air pressure increases within the thoracic cavity, pressure in the thoracic veins increases, speeding blood flow into the heart while valves in the veins prevent blood from flowing backward from the thoracic and abdominal veins.
1 sty 2014 · Vasodilation of the afferent arteriole leads to an increase in the renal blood flow; however, vasodilation of the efferent arteriole causes a decrease in the glomerular filtration rate. In heart failure patients, the administration of an ACE inhibitor has been shown in multiple trials to significantly reduce morbidity and mortality.
16 paź 2022 · This decrease in afferent signaling from the baroreceptor causes an increase in efferent sympathetic activity and a reduction in parasympathetic activity, which leads to vasoconstriction, increased heart rate, increased contractility, and an increase in BP.
