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27 Cards in this Set
- Front
- Back
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Use of cornea
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Refracts light
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Use of iris
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Controls pupil size
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Use of lens
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Focuses light onto retina
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Use of ciliary muscles
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Contracts=lens fattens
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Use of suspensory ligaments
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Attaches lens to ciliary muscles
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Use of retina
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Contains rods and cones
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Use of optic nerve
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Many neurones carry impulses to brain
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What is the fovea
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Greatest number of cones on retina
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What is the blind spot?
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Where the optic nerve leaves the eye=no image formed because no rods/cones
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Rod cells work in .... light and cone cells work in .... light
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Rod=dim
Cone=bright |
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These cells cannot distinguish colour. Are they rod or cone?
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Rod
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What is the difference in where you can find rod/cone cells?
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Rod = widespread
Cones=fovea only |
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What feature of a sensory neurone makes it easy to spot?
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Cell body in centre
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Name three adaptations of a motor neurone
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Fatty sheath-speeds up impulse
Dendrites-connects together neurones Long axon-Carries impulse a long way |
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Four differences between nervous/endocrine systems
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Nervous=electrical impulses
Endocrine=hormones in blood N=fast acting, E=slow acting N= short effect, E=long lasting N=localised effect, E=Widespread effect, only target cells respond |
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Name A-F
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A-cell body
B-myelin sheath C-Muscle D-Direction of impulse E-Axon F-Dendrites |
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What happens to the pupil in bright light? In terms of the muscles...
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Circular muscles contract
Radial muslces contract Pupil constricts |
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What happens to the pupil in dim light? In terms of the muscles...
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Circular muscles relax
Radial muscles relax Pupil dilates |
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Why do we need the iris reflex
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It ensures the right amount of light enters the eye
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Describe the stages of what happens between a stimulus being detected to the effector acting on it
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Stimulus
Receptor Sensory neurone Relay neurone Motor neurone Effector |
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What shape does the lens take for a nearby object
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Lens=fatter to refract MORE light
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What shape does the lens take for distant objects?
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Lens=thinner to refract LESS light
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What happens to the muscles in the eye to refract more light?
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Ciliary muscles contract
Suspensory ligaments slacken Lens becomes fatter More light focused on retina |
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What happens to the muscles in the eye to refract less light?
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Ciliary muscles relax
Suspensory ligaments go taut Lens becomes thinner Less light focused on retina |
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What does an image on the retina look like?
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It is inverted
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Label parts A-L
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A-receptor
B-sensory neurone C-Dorsal Root D-Dorsal Root Ganglion E-White matter F-Grey matter G-Spinal cord H-Synapse I-Cell body of motor neurone J-Ventral root K-Effector L-Motor Neurone |
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Label parts A-M
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A-Ciliary Muscles
B-Sclera C-Choroid Layer D-Retina E-Optic Nerve F-Blind Spot G-Fovea H-Vitreous Humor I-Lens J-Pupil K-Cornea L-Aqueous Humor M-Suspensory Ligaments |
