Anatomy & Physiology Genitourinary #4


Which is a waste product removed from the blood by the renal system?


  1. Water
    • Rationale:

      While extra water is filtered by the renal system, it is not a waste product.

  2. Bilirubin
    • Rationale:

      Bilirubin is excreted from the body in the stool by the gastrointestinal, not renal, system.

  3. Ammonia
    • Rationale:

      Ammonia, along with urea, are waste products that are removed from the body by the renal system.

  4. Carbon dioxide
    • Rationale:

      Carbon dioxide is removed from the body primarily by the respiratory, not renal, system.


A primary function of the renal system is to filter blood and create urine as a waste by-product for elimination from the body.


Learning Outcomes

The renal system produces, stores and eliminates urine (i.e., the fluid waste excreted by the kidneys). The kidneys manufacture urine by filtering wastes and extra water from blood. One waste product that is removed from the blood during this process is ammonia.

Test Taking Tip

Consider each choice and ask yourself, “Is this a waste product removed from the body with urination?” The choice you answer yes to is the correct answer for this question.

Video Rationale