Science Review Puzzle

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Across
  1. 1. Cavity a cavity that filters, warms, and humidifies air before it continues in the respiratory system
  2. 6. biological molecules responsible for the thousands of chemical inter-conversions that sustain life
  3. 7. diffusion with water only
  4. 8. crushes food and mixes it with saliva
  5. 9. Muscle tissue located underneath the lungs
  6. 10. a group of naturally occurring molecules that include fats, waxes, sterols, and vitamins
  7. 12. carries food from the pharynx to the stomach
  8. 13. branches that bring air into the inner part of the lungs
Down
  1. 2. sacs in the lungs that exchange oxygen for carbon dioxide
  2. 3. a type of membrane that lines the interior of the digestive system
  3. 4. Respiration chemical reactions that release energy from food
  4. 5. first 25 centimeters of the small intestine
  5. 9. the movement of substances from an area of high concentration to an area of low concentration
  6. 11. starts to break proteins down in the stomach