Across
- 7. focuses light
- 9. the two tubes that enter the lungs
- 11. chambers that warm and filter air
- 13. an animal that can regulate temperature internally
- 14. coloured part of the eye that changes the size of the pupil
- 17. white blood cell
- 19. lymph filtered here
- 20. _______, malleus and incus
- 22. afferent neurones carry impulses ________ the CNS
- 23. organ that turns sound waves into nerve impulses
- 26. _____ nerve sends signals to the brain
- 28. the smallest tubes involved in gas exchange
- 29. ___________ membrane also called the ear drum
- 30. red blood cell
- 31. fluid in the circulatory system
- 32. the sheet of muscle that enables respiration
Down
- 1. veins contains these to prevent backflow of blood
- 2. relies on its environment to regulate heat
- 3. contains the rod and cone cells
- 4. carries blood under pressure
- 5. external part of the ear
- 6. enables clotting
- 8. neurones that carry impulses away from the CNS
- 10. tiny air sacs
- 12. prevents food from entering the trachea
- 15. organs of respiration
- 16. neurones that cause muscles to activate
- 18. tube that transports air from the larynx
- 21. type of peripheral nerve
- 23. transparent covering on the front of the eye
- 24. transports lymphocytes
- 25. bats and dolphins use this to find food
- 27. blood vessels involved with gas exchange