nov.12 pt5 Flashcards
1
Q
In the dark, cGMP-gated channels
A
open, sodium influx, -40mV (balance of sodium, cGMP channels, potassium leak)
2
Q
closure of cGMP channels leads to
A
outward current and hyperpolarization
3
Q
one photon can lead to
A
depol 1 mV, affect bipol and ganglion cells
4
Q
amp steps
A
rhodopsin activate many g proteins and PDE hydrolyze many cGMP
5
Q
hyperpol of photoreceptors leads to decrease of
A
glutamate release
6
Q
photoreceptor cells are depolarized enough for ____ to be open
A
voltage gated calcium channels to be open, triggering glutamate release
7
Q
calcium causes photoreceptors to release
A
glutamate
8
Q
glutamate is released to
A
bipolar cells
9
Q
how bipolar cells respond to glutamate
A
hyperpol or depol, depending on type of glutamate receptor
