Little or no tubular reabsorption of creatinine occurs.
2.
Glomerular filtration, active tubular secretion, and tubular reabsorption are the main processes involved.
3.
Physiological actions of PTH include regulation of bone metabolism, renal tubular reabsorption of calcium and phosphate, and intestinal calcium absorption.
4.
Through unknown mechanisms, activation of the sympathetic nervous system leads to enhanced proximal tubular reabsorption of salt and water, as well as urea ( BUN ), calcium, uric acid, and bicarbonate.
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