Certified Hemodialysis Technician Practice Exam

The correct answer is 1% because it reflects the significant reabsorption process that occurs in the kidneys. The kidneys filter an enormous volume of blood daily, producing around 180 liters of glomerular filtrate. However, only about 1% of this filtrate is excreted as urine, which amounts to roughly 1.5 to 2 liters per day for a healthy adult. This high rate of reabsorption is crucial for maintaining the body's fluid and electrolyte balance. As the filtrate passes through the nephron, particularly in the proximal convoluted tubule and loop of Henle, a substantial amount of water (as well as essential electrolytes and nutrients) is reabsorbed back into the bloodstream, leaving only a small fraction to be eliminated as urine. The percentages in the other options significantly overestimate the volume of glomerular filtrate that becomes urine and do not accurately reflect normal kidney function and the body's need to conserve water.