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Juinior Certificate

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Term
Definition
Iris   Controls the amount of light entering the eye.  
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Pupil   Allows light to enter the eye.  
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Lens   Focuses light onto the Retina.  
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Retina   Absorbs light to allow us to see.  
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Optic nerve   Carries messages from the eye to the brain.  
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Cornea (H)   Protects eye and allows light to pass through it.  
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Ciliary muscle (H)   Causes the lens to change shape.  
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Stimulus   Causes a reaction.  
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Responce   Is the reaction.  
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Neuron   A nerve cell.  
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Sensory nerve   Carries messages to the brain.  
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Motor nerve   Carries messages from the brain.  
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