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