Excretory System Crossword Puzzle

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Across
  1. 2. The functions of this in the excretory system is to break down toxic waste chemicals in the blood into the urea.
  2. 4. The function of this in the excretory system is to remove carbon dioxide from the blood by exhaling it and inhaling oxygen.
  3. 5. Liquid waste called urine is passed through these two tubes called the?
  4. 7. This is the main organ in the excretory system. They are two bean like organs located on either side of the spine.
Down
  1. 1. The function of this in the excretory system is to remove solid waste.
  2. 3. The function of the kidneys is to filter out what?
  3. 6. The function of this in the excretory system is to eliminate excess water and salt through sweat glands.