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
4
What happens when a receptor is stimulated?
Creates a generator potential
5
What is generator potential?
Change in potential due to stimulus
6
What triggers an action potential?
Big generator potential
7
What is the threshold level?
Minimum potential for action potential
8
What are Pacinian corpuscles?
Pressure receptors in skin
9
What stimuli do Pacinian corpuscles detect?
Mechanical, e.g., pressure/vibrations
10
Where are Pacinian corpuscles found?
Skin
11
What are Pacinian corpuscles connected to?
Sensory neurones
12
What happens when Pacinian corpuscles are stimulated?
Deforms stretch-mediated sodium channels
13
What happens when sodium channels open?
Sodium ions diffuse in
14
What does sodium ion diffusion cause?
Generator potential
15
What happens if the generator potential exceeds the threshold?
Action potential is triggered
16
What are photoreceptors?
Light receptors in the eye
17
What do photoreceptors detect?
Light
18
Where are photoreceptors located?
Retina
19
What are the two types of photoreceptors?
Rods and cones
20
What do rods detect?
Black and white vision
21
What do cones detect?
Colour vision
22
What are the three types of cones?
Red, green, and blue
23
What are rods more sensitive to?
Dim light
24
Why are rods more sensitive?
Many rods join one neurone
25
Why are cones less sensitive?
One cone joins one neurone
26
What do cones provide better than rods?
Visual acuity
27
What is visual acuity?
Ability to tell close points apart
28
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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