Biology T1 p2

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Across
  1. 6. The uptake of molecular oxygen from the environment and the discharge of carbon dioxide to the environment.
  2. 7. Blood cells that perform the function of destroying disease-causing microorganisms.
  3. 9. Allows air to pass to and from lungs.
Down
  1. 1. Blood that carries an abundant amount of oxygen.
  2. 2. A column-shaped cell found in the respiratory and intestinal tracts, which secretes the main component of mucus.
  3. 3. A hollow, muscular organ that pumps blood throughout the body.
  4. 4. A thick, slippery substance produced by the body.
  5. 5. Main organs of the respiratory system.
  6. 8. Upper part of torso.