The physiologic processes of the kidney require certain constant factors. The tissue of the kidney must be normal if it is to concentrate the sodium chloride of the blood and maintain it at a constant level and if it is to maintain the nitrogenous factors of the blood at a normal level. The blood pressure must be within certain normal limits if the kidney is to secrete properly fluid and other products in solution. If the blood pressure is to be maintained at a certain level, the heart or propulsive force must be adequate, and the blood vessels must have a certain tone and consistency. The failure of any of these functions individually results in the failure of the general excretory functions of the kidney as a whole.
Physicians are familiar with the pictures that result from damage to the arteries and other blood vessels of the kidneys and those
EVANS TS. AZOTEMIA WITH NORMAL KIDNEYS FOUND POST MORTEM: POSSIBLE CAUSE: LOW BLOOD PRESSURE AFTER OPERATION. Arch Intern Med (Chic). 1931;48(6):1231–1236. doi:10.1001/archinte.1931.00150070169014
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