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What is a stimulus?
Any information an organism receives that might cause it to respond
What is the plural of stimulus?
Stimuli
Which organs are the major sense organs?
Eyes, ears, tongue, nose, skin
What does the pupil of the eye do?
Changes size to control how much light enters
Where does light form an upside-down image in the eye?
On the retina
What cells in the retina transform light into nerve signals?
Photoreceptors
Which nerve carries information from the eye to the brain?
Optic nerve
What does the brain do with signals from the optic nerve?
Interprets them as vision
What part of the eye controls how much light enters?
The pupil
What structure in the eye helps focus light onto the retina?
The lens
What part of the eye gives it colour?
The iris
What happens if the retina is damaged?
Vision is impaired or lost
What causes the eardrum to vibrate?
Vibrating air particles (sound waves)
Where are the vibrations transferred after the eardrum?
To the tiny bones of the middle ear
Which sensory neurons in the ear convert vibrations into nerve impulses?
Auditory hair cells in the cochlea.
Which nerve carries information from the ear to the brain?
Auditory nerve
