JBL EMT Practice Exam

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Worn-out blood cells, foreign substances, and bacteria are filtered from the blood by the:

  1. kidney

  2. liver

  3. pancreas

  4. spleen

The correct answer is: kidney

The correct answer is the kidney. The kidney plays a crucial role in filtering the blood by removing waste products, worn-out blood cells, foreign substances, and bacteria from the bloodstream. This process helps maintain the body's internal balance by ensuring that harmful substances are eliminated from the circulation. In contrast, the liver is primarily responsible for detoxifying chemicals, metabolizing drugs, and producing bile, while the pancreas mainly functions in digestion and blood sugar regulation. The spleen is involved in immune response and blood storage, but it is not the primary organ for filtering these substances from the blood.

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