1What are receptors specific to?
One kind of stimulus
2What do receptors detect?
Light, pressure, or glucose
3Where are receptors found?
On cell membranes
4What happens when a receptor is stimulated?
Creates a generator potential
5What is generator potential?
Change in potential due to stimulus
6What triggers an action potential?
Big generator potential
7What is the threshold level?
Minimum potential for action potential
8What are Pacinian corpuscles?
Pressure receptors in skin
9What stimuli do Pacinian corpuscles detect?
Mechanical, e.g., pressure/vibrations
10Where are Pacinian corpuscles found?
Skin
11What are Pacinian corpuscles connected to?
Sensory neurones
12What happens when Pacinian corpuscles are stimulated?
Deforms stretch-mediated sodium channels
13What happens when sodium channels open?
Sodium ions diffuse in
14What does sodium ion diffusion cause?
Generator potential
15What happens if the generator potential exceeds the threshold?
Action potential is triggered
16What are photoreceptors?
Light receptors in the eye
17What do photoreceptors detect?
Light
18Where are photoreceptors located?
Retina
19What are the two types of photoreceptors?
Rods and cones
20What do rods detect?
Black and white vision
21What do cones detect?
Colour vision
22What are the three types of cones?
Red, green, and blue
23What are rods more sensitive to?
Dim light
24Why are rods more sensitive?
Many rods join one neurone
25Why are cones less sensitive?
One cone joins one neurone
26What do cones provide better than rods?
Visual acuity
27What is visual acuity?
Ability to tell close points apart
28Where is light focused in the eye?
Fovea
29What is the fovea rich in?
Cones
30Where are rods mainly located?
Peripheral retina