Multiple choice

A/An _________ is the functional unit of the kidney.

  1. electron

  2. sclera

  3. nephron

  4. capillary

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The nephron is the microscopic functional unit of the kidney that filters blood and produces urine. Each kidney contains about 1 million nephrons, which consist of glomeruli and renal tubules. Electrons are subatomic particles, sclera is eye white tissue, and capillaries are small blood vessels but not kidney functional units.

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