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