Receptors
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1
What are receptors specific to?
One kind of stimulus
2
What do receptors detect?
Light, pressure, or glucose
3
Where are receptors found?
On cell membranes
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What happens when a receptor is stimulated?
Creates a generator potential
5
What is generator potential?
Change in potential due to stimulus
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What triggers an action potential?
Big generator potential
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What is the threshold level?
Minimum potential for action potential
8
What are Pacinian corpuscles?
Pressure receptors in skin
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What stimuli do Pacinian corpuscles detect?
Mechanical, e.g., pressure/vibrations
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Where are Pacinian corpuscles found?
Skin
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What are Pacinian corpuscles connected to?
Sensory neurones
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What happens when Pacinian corpuscles are stimulated?
Deforms stretch-mediated sodium channels
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What happens when sodium channels open?
Sodium ions diffuse in
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What does sodium ion diffusion cause?
Generator potential
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What happens if the generator potential exceeds the threshold?
Action potential is triggered
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What are photoreceptors?
Light receptors in the eye
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What do photoreceptors detect?
Light
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Where are photoreceptors located?
Retina
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What are the two types of photoreceptors?
Rods and cones
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What do rods detect?
Black and white vision
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What do cones detect?
Colour vision
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What are the three types of cones?
Red, green, and blue
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What are rods more sensitive to?
Dim light
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Why are rods more sensitive?
Many rods join one neurone
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Why are cones less sensitive?
One cone joins one neurone
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What do cones provide better than rods?
Visual acuity
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What is visual acuity?
Ability to tell close points apart
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Where is light focused in the eye?
Fovea
29
What is the fovea rich in?
Cones
30
Where are rods mainly located?
Peripheral retina
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