Topic 6 Rods And Cones Flashcards
Where are rods and cones found?
What are rods and cones?
Rods and cones are found in the retina.
Rods and cones are photoreceptors.
What is the distribution of Rods and cones?
Most cones cells located near fovea, so has highest concentration of cones found near fovea.
Rods evenly distributed across the eye.
What is the function of Rods?
What are some of the properties?
Rods process images in black and white.
Rods detect light of very low intensity.
Low visual acuity.
Spacial Summation
What pigment is present in rods?
Rhodopsin
Why can do Rod detect light of very low intensity and low visual acuity?
Many rods connected to one sensory neurone.
How much energy needed to break down rods and why?
What is Broken down in Rhodopsin?
Doesn’t take a lot of energy to break down rhodopsin as rods cells function at low Light intensities due to Spacial Summation
How many cones cells are there and why?
There are 3 cones cells are there are 3 different iodopisn pigment for cones.
You got red,green and blue iodopsin which absorb different wavelength of light.
What are the properties of cones?
High visual acuity.
High light intensity
Why is high light intensity needed to break down iodopsin?
One cone cells is connected to a bipolar cell so no spatial summation so cones only respond to high light intensity
(That why we can’t see colour when it’s Dark)
Why is there a different properties in Rods and Cones?
Rods have many rods connected to one sensory neurone.
Each cone is connected to one bipolar cell.
