Approximately how many nephrons are found in each human kidney?

• A. About 1 million
• B. About 100 million
• C. About 1,000
• D. About 10,000

Answer: (A)

Verified step by step guidance

1. Understand that nephrons are the microscopic functional units of the kidney responsible for filtering blood and forming urine.
2. Recall that each human kidney contains a large number of nephrons to efficiently filter blood and maintain homeostasis.
3. Recognize that the typical number of nephrons per kidney is on the order of millions, not thousands or hundreds of millions.
4. Use anatomical and physiological references which state that each kidney contains approximately 1 million nephrons.
5. Conclude that the correct estimate for the number of nephrons in each human kidney is about 1 million.