Life processes

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Across
  1. 3. Tiny blood vessels where exchange of substances occurs
  2. 7. The process of converting glucose to energy in the absence of oxygen
  3. 9. The site of gas exchange in the lungs
  4. 10. The process by which green plants make their own food using sunlight
  5. 13. When you breathe in, air travels from your nose or mouth through your _______.
  6. 14. The organ that filters blood and produces urine
  7. 15. The process of breaking down food into simpler substances
  8. 16. A long tube that connects the mouth to the stomach
  9. 19. The muscular organ that pumps blood throughout the body
  10. 20. The process of taking in food and breaking it down for energy
Down
  1. 1. The removal of waste products from the body
  2. 2. The system responsible for transporting nutrients and oxygen to cells
  3. 4. The small intestine's finger-like projections that increase surface area for absorption
  4. 5. The main site of cellular respiration in cells
  5. 6. A biological catalyst that speeds up a chemical reaction
  6. 8. Process by which organisms take in oxygen and release carbon dioxide
  7. 11. The functional unit of the kidney
  8. 12. The semi-liquid substance formed in the stomach during digestion
  9. 17. Blood vessels that carry blood away from the heart
  10. 18. A green pigment in plants that absorbs light energy for photosynthesis