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Sense Organs LC Biol

Receptor Cells sensitive to stimulus, usually concentrated in a sense organ
Sclera .outer layer of eye .opaque .protective
Choroid .Middle eye layer .Black with melanin .prevents internal rflection .contains blood vessels
Aqueous Humour .watery filling in front of lens .gives front of eye shape
Vitreous Humour .jelly filling behind lens .shapes back of eye
Outer transparent part of sclera at the front of the eye
Retina Inner layer Light sensitive Image forms here Contains rods + cones
Lens Transparent convex jelly Focuses light rays onto retina
Ciliary muscle Accommodation Changes lens shape to focus Near / far objects
Suspensory ligaments Hold lens in place
Iris Coloured muscle Adjusts pupil size by reflex Control amount light entering
Pupil Hole in iris Lets light in
Blind spot Part of retina with no rods or cones No vision
Optic nerve Sensory nerve Brings images from retina to brain
Eye Muscle Anchors eye ball in socket Eye movements
Rods Light sensitive cells in retina Most numerous + everywhere Dim light Black n white
Cones Least Concentrated in the fovea Bright light Colour
External auditory canal Links pinna to inner ear Carries sound waves to eardrum
Pinna Funnels sound waves into inner ear
Eardrum Tympanic membrane Vibrates with sound waves Passes on to ossicles
Eustachian tube Links middle ear to pharynx Equalises pressure either side of eardrum Prevents eardrum bursting



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