8.2 - Reception of stimuli Flashcards
(11 cards)
1
Q
what are the two photoreceptors in the retina?
A
rod and cone cells
2
Q
what do the rods and cones synapse with?
A
a bipolar neurone
3
Q
how many impulses does the brain receive from a rod cell?
A
one
4
Q
how many impulses does the brain receive from a cone cell?
A
multiple
5
Q
which photoreceptor can detect light in low light intensities?
A
rod cells
6
Q
which photoreceptor can detect light in high light intensities?
A
cone cells
7
Q
what pigment absorbs light in the rod and cone cells?
A
rhodopsin
8
Q
what are the two phytochromes?
A
Pr and Pfr
9
Q
which is the active form of the phytochrome?
A
Pfr
10
Q
what is the photoperiod?
A
the environmental cue that determines time of flowering
11
Q
what does Pfr act as?
A
a transcription factor
