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TimKlintworthSenses (Types of Stimulus (Chemoreceptor (Sensitive to…
TimKlintworthSenses
Types of Stimulus
Chemoreceptor
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Air, saliva, water, chemicals in blood
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Mechanoreceptor
Touch, pressure, vibration, stretch
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The Eye
Components
Fibrous Layer
Sclera
- white
- Protective
- Gives Shape
- Anchors muscles
- Dense Connective tissue
Cornea
- Clear
- Allows light into the eye
- Involved in focusing light in retina
Vascular Layer
Choroid
- Blood Vessels
- Deeply pigmented
- Nourishes other layers
- Absorbs Light
Inner Layer
Retina
- Photoreceptors
- Axons Coverage from optic nerve
Rods
- A lot
- Sensitive to Light
- Ability to see in low light
Cones
- Fewer
- Best in bright light
- See in color
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Iris
- Intrinsic Muscle (sphincter)
- Dilatation and Constriction
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Fovea Centralis
- Center of Macula Lutea
- Clearest vision
Anterior segment
- From iris to cornea
- Filled with aqueous humor
Posterior segment
- From iris to posterior segment
- Filled with vitreous humor
- Supports retina and lens
Pathway
Cornea --- Pupil---lens--- posterior segment---retina---optic nerve--optic chiasma---mid brain---thalamus---primary visceral cortex of the occipital lobe