1. Sensory System

2. 1B3 Sensory System OB30locate the main parts of the eye on a model or diagram and describe the function of the cornea, iris, lens, pupil, retina, optic nerve and ciliary muscle

3. front view of the eye “white” iris pupil

4. Internet diagram

5. Inside of the eye pupil iris lens optic nerve retina Ciliary muscle cornea

6. light rays the cornea allows light to enter the eye, and refracts (bends) the rays

7. the lens focuses light rays to form a clear image on the retina, where sensory cells detect the image

8. the iris contracts and relaxes in response to light conditions… …this changes the size of the pupil, controlling the amount of light entering the eye…

9. the optic nerve brings a message to the brain about what we see

10. side view lens ciliary muscle lenslens front view the function of the ciliary muscle is to contract and relax to change the shape of the lens

11. can you remember what’s what? G A B C D E F G CLICK FOR ANSWERS CORNEA RETINA PUPIL OPTIC NERVE IRIS LENS CILIARY MUSCLE

12. Choose a name from the list above to match the functions in the table 1. contains sensory cells which detect images 2. contracts and relaxes to change the shape of the lens 3. allows light into the eye and refracts (bends) the rays 4. brings messages to brain about what we are seeing 5. allows light into the inside of the eye 6. contracts and relaxes to change the size of the pupil 7. focuses a clear image on the retina retina ciliary muscle cornea optic nerve pupil iris lens

13. Look at the diagram and explain what is happening

14. H/W P74 Q 6,7,8,9.