The Respiratory System

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Across
  1. 2. This is the moist cavity behind the nose and mouth. It serves as an entry for the trachea (windpipe) and the esophagus. Because of this, it can be considered part of both the respiratory system and the digestive system.
  2. 4. These two airways carry oxygen from the trachea to the lungs.
  3. 5. This organ beneath the lungs alternately presses and pulls on the lungs, expanding them during inhalation and contracting them during exhalation.
  4. 6. These small air sacs exchange oxygen and carbon dioxide throughout the bloodstream.
Down
  1. 1. These numerous, branching airways carry oxygen to the alveoli and also help to regulate the flow of air throughout the respiratory system.
  2. 3. Also known as the windpipe, this airway passes just-inhaled air into the bronchi.
  3. 7. The function of this pair of spongy organs is sending oxygen all throughout the body.