The Excretory and Respiratory System

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Across
  1. 3. this structure connects the trachea to the lungs
  2. 5. process that removes carbon dioxide from the body
  3. 6. the largest organ of the human body
  4. 9. layer of the skin that contains sweat glands, hair follicles, and sensory receptors
  5. 10. waste product that helps keep the body cool
  6. 12. where respiration occurs
  7. 13. the structure of the skin responsible for creating sweat
Down
  1. 1. this is where the alveoli are found in the body
  2. 2. layer of the skin that contains fat cells
  3. 4. layer of the skin that prevents bacteria from entering the body
  4. 7. humans primarily breathe in air through their ___.
  5. 8. any type of waste that the body creates or produces is known as a ____.
  6. 11. known as the body's "windpipe", this body part allows humans and other mammals to breathe