1. 1B3
Sensory System

2. 1B3 Sensory System
OB30 locate 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 click for labels “white” pupil iris
OB30 locate 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
front view of the eye
click for labels
“white”
iris
pupil

4. OB30 locate 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
Inside of the eye
pupil
iris
lens
optic nerve
retina
Ciliary muscle
cornea

5. A B C D E F G can you remember what’s what? CORNEA RETINA PUPIL
OB30 locate 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
can you remember what’s what? G A B C D E F G
CORNEA
CLICK FOR ANSWERS
RETINA
PUPIL
OPTIC NERVE
IRIS
LENS
CILIARY MUSCLE

6. OB30 locate 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
light rays
the cornea allows light to enter the eye, and refracts (bends) the rays

7. the iris contracts and relaxes in response to light conditions…
OB30 locate 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
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…

8. OB30 locate 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
the lens focuses light rays to form a clear image on the retina, where sensory cells detect the image

9. the optic nerve brings a message to the brain about what we see
OB30 locate 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
the optic nerve brings a message to the brain about what we see

10. OB30 locate 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
the function of the ciliary muscle is to contract and relax to change the shape of the lens
side view
lens
ciliary muscle
l e n s
front view

11. retina cornea optic nerve pupil iris lens click for answers
OB30 locate 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
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
click for answers

12. Look at the diagram and explain what is happening
OB30 locate 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
Look at the diagram and explain what is happening

13. What do you think? Why do we need to blink?
Find out what happens to the size of the pupil of your eye (i) in bright light (ii) in dim light ?
The eye is round, but the cornea at the front is extra curved. Can you think of a reason for this?

14. 1B3
Sensory System