Bio 30-1 Ch 14 The Senses

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14 Terms

1

Explain Sensory Adaptation

Sensory receptors/neurons adjust to a stimulus and cease to fire despite the stimulus still being there. The threshold level has moved up.

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2

Whats the difference between how taste and smell detect stimulus

Taste - detects dissolved chemicals

Smell - detects airborne chemicals

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3
<p>What is 1 &amp; its function?</p>

What is 1 & its function?

Cornea - Transparent cells to bend light towards pupil

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4
<p>What is 2 &amp; its function?</p>

What is 2 & its function?

Retina - contains light-sensitive cells called rods and cones

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5
<p>What is 3 &amp; its function?</p>

What is 3 & its function?

Lens - focuses the image onto the retina

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6
<p>What is 4 &amp; its function?</p>

What is 4 & its function?

Pupil - Opening in the iris where light is let into the eye

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7
<p>What is 5 &amp; its function?</p>

What is 5 & its function?

Iris - A muscle that controls the size of the pupil and therefore the amount of light let into the eye

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8
<p>What is 6 &amp; its function?</p>

What is 6 & its function?

Sclera - White outer layer that maintains the eye’s shape and protects it.

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9
<p>What is 7 &amp; its function?</p>

What is 7 & its function?

Choroid layer - contains blood vessels

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10
<p>What is 8 &amp; its function?</p>

What is 8 & its function?

Optic nerve - Carries the stimulus to the brain

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11

What’s the function of Rods & Cones?

Rods - B&W vision, high light sensitivity, used for seeing in the dark, low definition, peripheral

Cones - Colour vision (3 types of cones), requires bright light Fovea Centralis

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12

Explain the difference between Fovea Centralis & Peripheral vision

Peripheral vision - High Rods

Fovea Centralis - High SA & Cones & most sensitive part of the eye

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13

Know Vision Defects brah

cataracts, glaucoma, astigmatism, colourblindness, near/far sightedness

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14
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