a river in E Asia, forming most of the boundary between N Manchuria and the SE Russian Federation, flowing into the Sea of Okhotsk. About 2700 miles (4350 km) long.
High blood pressure is dangerous, partly because there are no symptoms, so organ damage can occur slowly without being recognized. Renal hypertension can cause chronic kidney disease. This is a slow decline in kidney function. Until the condition is well advanced, chronic kidney disease also causes no symptoms. Because there are usually no symptoms, a doctor may suspect renal hypertension when someone has uncontrolled high blood pressure despite multiple medications or has unexplained chronic kidney disease.
The kidneys help to regulate the blood pressure by increasing (when blood pressure falls) or decreasing (when blood pressure rises) the blood volume, and also by the renin-angiotensin system described above. The kidney-fluid system is the main method of the long-term control of blood pressure. In addition to the RAAS sytem, renal blood flow is regulated by: Pressure Diuresis: As arteriolar blood pressure increases, so flow through the kidneys also increases and this increases filtration rate and urinary output.