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The blind spot is also called the ____

optic disk

Rods have _____ (more or less) disks than cones do

more

Rods have a _____ (higher or lower) photopigment concentration than cones

higher

Rods are ____ (more or less) sensitive to light than cones are

more

Approximately how many rods do we have?

100 million

Approximately how many cones do we have?

5 million

Only cones operate at ____ lighting

photopic

Both rods and cones operate at ____ lighting

mesopic

Does the peripheral retina contain a higher or lower concentration of rods to cones, as compared the central retina?

higher

The peripheral retina has a ____ (high or low) ratio of photoreceptors to ganglion cells

high

True or False: Rods and cones are found in both the peripheral retina and the central retina

false

The central retina is specialized for ______ vision

high resolution

The area of the retina specialized for high visual acuity is known as the _____

fovea

_________ of cells above photoreceptors reduces scattered light

lateral displacement

An impairment in perception of long wavelengths is known as ________

protanopia

True or False: Colourblindness is often due to a defiency in the absorption of photopigments rather than a decrease in number of them

true

Does retinitis pigmentosa affect the central or peripheral vision?

peripheral

Which disease results in a loss of central vision, but maintains peripheral vision

macular degeneration

Do photoreceptors depolarize or hyperpolarize in response to light?

hyperpolarize

Photoreceptors release _____ (less or more) neurotransmitter in the dark

more

Trans retinol is transported into the pigment epithelium via a(n) _____ protein

IRB

Trans retinol is converted to _____ in the pigment epithelium

cis retinal

Does Calcium increase or decrease sensitivity to light?

decrease

decreases

cGMP channels ____ (open or close) in the presence of light

close

A decrease in Calcium will ____ (increase or decrease) the activity of Guanylate cyclase

increase