Multiple choice general knowledge

The main function of the kidney is

  1. To control blood pressure

  2. To control body temperature

  3. To remove waste product from the body

  4. To help in digestion of food
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The kidney's primary function is filtering blood to remove waste products and excess substances, excreting them as urine. Each kidney contains about one million nephrons that perform this filtration. While kidneys also help regulate blood pressure and produce hormones, waste removal is their MAIN function. The other options describe functions of other systems (circulatory, nervous, digestive).

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