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12 terms

Two Types of Photoreceptors

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Two Types of Photoreceptors
Rods
Cones
Rods
highly sensitive to minimal light, allows us to see at night (shapes and movement)
rhodopsin split into opsin and retinene in photon of light....opsin and retinene turn ATP into ADP and combine back to make rhodopsin
opsin
triggers nerve impulse
retinene
visual yellow, vit a is required to make
disc
contain rhodopsin
rhodopsin
a reddish purple pigament
Ghost images
in bright light, rhodopsin is broken down faster than it can be remanufactured (look at light, close eyes, still there..rods)
Cones
receptors for color and visual acuity (sharp vision)
highest concentration in the
macula lutea
fovea centralis
*Cones contain three types of photopigaments that require bright light for breakdown (these are yet unidentified)
Normal Population Breakdown
green cones
blue cones
red ones
*white light results in all of the cones firing
green cones
10%
blue cones
16%
red cones
74%