Lower Respiratory System

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Across
  1. 4. Tiny air sacs where gas exchange occurs
  2. 6. Single microscopic sac for oxygen and carbon dioxide exchange
  3. 8. Protective layers surrounding the heart
  4. 10. Inner membrane directly covering the lungs
  5. 12. Fluid-filled space between lung membranes
  6. 15. Three-lobed respiratory organ on the body’s right side
  7. 16. Breastbone that anchors the ribs at the front of the chest
  8. 17. Muscle between ribs that aids in breathing
Down
  1. 1. Outer membrane lining the chest cavity
  2. 2. Major vessel carrying deoxygenated blood from the heart to the lungs
  3. 3. Cluster of alveoli resembling a bunch of grapes
  4. 5. Tiny openings connecting adjacent alveoli
  5. 7. Windpipe that carries air from the larynx to the lungs
  6. 9. Food tube running behind the trachea
  7. 11. Two-lobed lung that makes room for the heart
  8. 13. Immune-related gland sitting just above the heart in the chest
  9. 14. Chest structure made of ribs, muscles, and connective tissue