The Body In Action

1. The Body In Action (C) CO-ORDINATION

2. 1. What is the advantage of having 2 eyes looking forward at the same object ? 2 eyes allow the brain to judge distance.

3. Below is a table showing parts of the eye. Complete the functions 2. Contains nerve endings Lens Cornea Allows light to enter the eye Iris

4. 3. Which structure in the eye sends light messages to the brain? Optic Nerve

5. 4. Here is a table showing parts of the ear. Can you complete the spaces? Eardrum Ear bones Carry impulse from ear to brain. Semi -circular canals

6. 5. How do we judge the direction from which sound is coming? Use 2 ears to judge distance and direction

7. Complete the following passage about hearing. 6. The ear collects ……… waves. The sound waves are directed down the ……………. canal to the ……… . This begins to vibrate and starts the tiny …… …… moving. Their movements transmit sound ………. towards the ……… … The fluid in the cochlea now starts moving, stimulating the sound ………… cells which send a sound ………… along the auditory ………… to the brain. sound auditory eardrum ear bones cochlea waves receptor impulse nerve

8. What is the function of the following parts of the nervous system? 7. Controls the whole body and co-ordinates all nerve impulses. • Brain - • Spinal cord - • Nerves - Controls reflexes. Relays impulses between nerves and brain. Carries impulses to and from muscles and body organs.

9. 8. Give the functions of the following parts of the brain. controls breathing and heartbeat • Medulla - • Cerebrum - • Cerebellum - controls memory, intelligence and personality controls balance and muscle co-ordination

10. 9 • The --------- speeds up the heart during exercise. • A cat has a relatively larger ---------- than humans • Reasoned thought is controlled by the ---------- • The ---------- makes us breathe faster during exercise. medulla cerebellum cerebrum medulla

11. 10. What is a reflex action? An automatic motor response to a sensory stimulus, independent of the brain.

12. 11 What happens to the pupil of the eye in bright light? The pupil gets smaller

13. 12. Name the 5 parts of a reflex arc. • Sensory receptor • Sensory nerve • Relay nerve • Motor nerve • Motor organ

14. 13. Where is the relay nerve found? In the spinal cord

15. 14. The nervous system consists of the …………, the spinal cord and the nerves. brain

16. 15. Which structure in the brain controls reasoning? The cerebrum

17. 16. What is the name of the organ in the ear which controls balance? Semi circular canals

18. 17. What is the function of the retina? Contains nerve endings sensitive to light

19. 18. Name the structure which relays impulses between nerves and brain. The spinal cord

20. 19. What is the function of the medulla? It controls heart rate and breathing rate.

21. 20. Which part of the brain sorts out information from the semi circular canals? Cerebellum

22. Did you manage to answer all the questions correctly? These revision questions will automatically run again. If you want to return to the list of revision topics click on the back browser button on your toolbar.