Biology Topic Crossword

123456789101112
Across
  1. 4. Smaller tubes which connect the bronchi and the alveoli
  2. 7. During inhalation air pressure ________
  3. 9. Two tubes which split from the trachea
  4. 10. To use oxygen
  5. 11. A sheet of internal skeletal muscle that separates the thoracic cavity from the abdominal cavity.
  6. 12. Small air sacs found in the lungs, sit of gas exchange
Down
  1. 1. During exhalation air pressure ________
  2. 2. The external intercostal muscles do this during inhalation.
  3. 3. This is in the air we breathe and it is very important for our body system.
  4. 5. The process of releasing energy from food as part of a chemical reaction. Happens inside the cells of all living things.
  5. 6. The process of taking air and expelling it from the lungs.
  6. 8. _____muscles-the muscles situated in the ribs that create and move the chest wall.