Across
- 3. The movement of substances from an area of high concentration to low concentration
- 5. Wave-like muscle contractions that move food along the digestive tract
- 6. Organic molecules made of carbon, hydrogen, and oxygen; main source of energy for cells
- 8. Protein produced by white blood cells that binds to and helps destroy pathogens
- 9. Disease-causing organism
- 10. Process of releasing energy from food, usually glucose, in cells
- 12. Location of gas exchange in the lungs
- 14. stable complex of carbon monoxide and haemoglobin that forms in red blood cells
- 15. Plant hormone that controls cell elongation and growth
- 17. Burning of fossil fuels, releasing carbon dioxide
- 19. Action Rapid, automatic response to a stimulus
- 20. Neuron Neurone that carries impulses from receptors to the CNS
- 21. Substance that triggers an immune response
- 23. Main artery carrying oxygenated blood from the heart to the body
- 24. White blood cell that produces antibodies
Down
- 1. Lower chambers of the heart that pump blood out
- 2. The molecule upon which an enzyme acts
- 4. Process by which plants use light energy to convert carbon dioxide and water into glucose and oxygen
- 5. Growth response of a plant toward light, regulated by auxin
- 7. Removal of undigested food as faeces
- 11. Conversion of nitrates back into nitrogen gas by bacteria
- 13. Fixation Conversion of nitrogen gas from the air into nitrates by bacteria
- 16. Substance produced by the liver, stored in the gall bladder, that helps digest fats
- 18. Conversion of ammonia into nitrates by bacteria
- 22. Neurone that carries impulses from the CNS to effectors
- 25. White blood cell that engulfs and digests pathogens