Across
- 2. smooth muscle in the walls of the bronchi do what when more air is needed in the lungs
- 5. what do goblet cells produce?
- 7. the number of breaths taken in one minute
- 10. the metabolic rate of an organism when at rest
- 11. an opening in the exoskeleton of an insect which has valve
- 12. The walls of the alveoli are...cell thick
- 13. rate the greater the mass of an organism, the higher the ....
- 15. each ciliated epithelium cells have small projections of... which sweep mucus, dust and bacteria away from the lungs
- 16. breathing out
- 17. volume the volume of air that is breathed in or out during normal breathing (at rest)
- 18. specialised cells found in the roots of plants
- 19. in a mammal ... rings help to support the trachea
- 21. elastic fibres enable the lung to stretch and ...
- 22. breathing in
- 23. The air in the alveoli contains a high concentration of...
- 24. volume of oxygen used up by someone in a given time
- 26. Each alveolus is surrounded by an extensive network of...
Down
- 1. how water enters the root hair cell
- 3. tubes within the insect respiratory system which lead to tracheoles
- 4. The blood in the capillaries have a high concentration of...
- 6. Oxygen and carbon dioxide are exchanged in a process of ...
- 8. All insects possess a rigid ...
- 9. the maximum volume of air that can be breathed in or out in one breath
- 14. where gas exchange takes place in humans
- 20. what organisms need to carry out biochemical processes required for survival
- 25. extensive capillary system that covers the counter-current the system which ensures that the blood flow is in the opposite direction to the flow of water in fish gills