The Respiratory System

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Across
  1. 2. Carries air to to the lungs.
  2. 6. Prevents food from going down the airway.
  3. 7. Tiny hairs that remove dust and other particles from inhaled air.
  4. 9. The respiratory organs.
Down
  1. 1. The mechanical action of getting air in and out of the lungs.
  2. 3. Tiny air sacs surrounded by blood vessels. The site of gaseous exchange.
  3. 4. Moisturises, purifies and cleans the air. Mucous and tiny hairs remove dust and other particles.
  4. 5. During inhalation, the intercostal muscles ___________, causing the ribs to move up and out.
  5. 7. Rings of _______________ keep the trachea open.
  6. 8. Also known as the voice box.