Respiration and gas exchange

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Across
  1. 2. Specialized cells in the respiratory tract that secrete mucus to trap pathogens and dust
  2. 4. A carcinogen in cigarette smoke that stimulates excess mucus production and clogs cilia
  3. 5. Tiny air sacs in the lungs where gas exchange occurs
  4. 7. Pores found mainly on the underside of leaves that allow for the exchange of CO2
  5. 10. A type of respiration that breaks down nutrient molecules to release energy without using oxygen
Down
  1. 1. The type of acid that builds up in muscles during vigorous exercise, causing fatigue and an oxygen debt
  2. 3. The windpipe that connects the throat to the bronchi and is supported by C-shaped cartilage rings
  3. 6. A thin sheet of muscle that flattens to increase the volume of the chest cavity during inhalation
  4. 8. The alcohol produced as a byproduct of anaerobic respiration in yeast
  5. 9. The movement of gas molecules from an area of high concentration to an area of low concentration