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Topic 6

Rod and cone cells Photo receptors in the human retina

TermDefinition
3 receptors Rods Cone Pacinian corpuscle
Which receptors does the retina have Rods and cone cells
How is a generator potential reached This is reached through the pigment of rod cells(rhodopsin) being broken down by light energy Enough pigment has to be broken down for the threshold to be met in the bipolar cell
Why can the threshold be reached even in low light Many rod cells are connected to a single bipolar cell This is an example of summation
What does retinal convergence mean This means that the brain cannot distinguish between seperate sources of light that stimulated it
What aculity do rod cells have Rod cells have a low visual aculity
What are the 3 different cone cells that contain different types of iodopsin pigments Red, Green, and Blue
Why does no spatial summation occur in cone cells This is because one cone cell connects to biopolar cell Cones can only respond to high light intensity which is why we cant see colour when its dark
What aculity does cone cells have They have a high visual aculity
Why is this This is because each cone is connected to one bipolar cell the brain can distinguish between seperate sources of light
What is the distribution like of rods and cones in the retina These are uneven light is focused on the fovea which will recieve the highest intensity of lught
Why are cone cells located near fovea They respond to high light intensities
Why are rod cells located further away from the fovea They respond to lower light intensities
Created by: yHya
 



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