Each human kidney contains approximately ______ functional nephrons ?
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Answer: A. One million
Explanation
Histological studies confirm that each healthy human kidney contains roughly one million microscopic nephrons. These complex filtering units are responsible for cleansing blood and producing urine. Therefore each kidney possesses approximately one million functional nephron units. The nephron is the basic structural and functional unit of the vertebrate kidney. Each nephron consists of a renal corpuscle and a long renal tubule system. Human kidneys cannot regenerate lost nephrons following severe injury or disease.
Nephrologists monitor total functioning nephron mass to assess chronic kidney disease progression. Kidney donors can live healthy lives with a single remaining set of one million nephrons. Hypertension and diabetes gradually destroy these delicate microscopic filtration units. Two million nephrons represents the total combined count for both human kidneys together. Four million nephrons exceeds normal human anatomical physiological parameters significantly. Half a million nephrons underestimates the normal functional unit count per individual kidney.
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