Respiratory system

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Across
  1. 1. Muscle: Muscles between the ribs, aiding in the expansion and contraction of the chest during breathing.
  2. 4. Microscopic air sacs at the end of bronchioles where oxygen and carbon dioxide exchange occurs.
  3. 7. The tubes that branch off from the trachea, leading air into the lungs' different lobes.
  4. 8. The process of inhaling and exhaling, involving the coordinated effort of respiratory muscles and lung function.
  5. 9. Organs responsible for gas exchange, where oxygen is taken in, and carbon dioxide is expelled.
Down
  1. 2. The primary external opening for the respiratory system, filtering and humidifying inhaled air.
  2. 3. The windpipe connecting the larynx to the bronchi, allowing air to pass into the lungs.
  3. 5. A large muscle beneath the lungs that contracts and relaxes, causing changes in air pressure to facilitate breathing.
  4. 6. Smaller air passages within the lungs that extend from the bronchi, further dividing into tiny air sacs.