hms 6 bioelectricity start Flashcards
1
Q
2 main cations that contribute to electrical properties of neurons
A
Na+ and K+
2
Q
what is electricity in the body
A
separation of charge stored energy
3
Q
what does the lipid bilayer act as
A
an insulator prevent free flow of ions
4
Q
how ions move across membranes
A
through pores or channels selective different sizes
do not diffuse through gradient
5
Q
how is this gradient maintained
A
ATPase NaK pump 3Na+ out, 2 K+ in
6
Q
neurons vary??
A
not at RMP mostly, varies in size and time
7
Q
when resting…
A
a few K+ channels are open
8
Q
Na+ channels are open
A
positive Na+ ions in
depolarised
=excitatory
9
Q
K+ channels are open
A
positive K+ ions out
repolarised/ hyperpolarised
=inhibitory
