First, the glomerulus filters blood like a fine sieve, making the filtrate. Then, in tubules, reabsorption brings back glucose and salts, and secretion adds wastes, concentrating it into urine. But my real lesson came watching Papa’s reports after Maa’s kidney trouble – seeing the creatinine numbers rise, I understood filtration isn’t just diagrams, it’s his anxious night visits to the doctor.
#exams#study
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