The Respiratory System

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Across
  1. 2. We breathe out to send this gas out of our lungs
  2. 6. Tiny, balloon-shaped air sacs in the lungs
  3. 7. This organ sends blood that is low on oxygen to the lungs to fill them with oxygen again
  4. 8. The respiratory system is lined with a mucous membrane that secrets mucus
  5. 9. Tiny blood vessels located in the walls of the alveoli
  6. 10. A dome-shaped sheet of muscle that separates the chest from the abdomen
  7. 11. The pair of spongy, air-filled organs located on either side of the chest
Down
  1. 1. We breathe in to take this gas into our lungs
  2. 3. The airways that conduct air into the lungs
  3. 4. This tube, also known as the windpipe, connects the larynx (voice box) to the bronchi
  4. 5. This tube connects the throat to the stomach and is located behind the trachea and heart