Physiology Flashcards
1
Q
pacemaker potential is due to
A
decrease in K+ efflux
2
Q
Depolarization due to
A
activation of L-type calcium channels, causing calcium influx
3
Q
repolarisation due to
A
activation of K+ channels resulting in potassium efflux
4
Q
phase 0- pacemaker
A
depolarisation
ca channels open, Na channels close
slow conduction= AV nodal delay
5
Q
phase 3- pacemaker
A
repolarisation
Ca channels close, K+ channels open= K efflux
6
Q
phase 4- pacemaker
A
Slow depolarisation funny current that has mixed Na/K inward current causing slow depolarisation important to determine HR adenosine > decrease catecholamines > increase
7
Q
phase 0- ventricular muscle
A
depolarisation due to Na influx
8
Q
phase 1- ventricular muscle
A
closure of Na channels and transient K efflux
9
Q
phase 2- ventricular muscle
A
plateau phase
Ca2+ influx through L type Ca2+
10
Q
phase 3- ventricular muscle
A
closure of Ca channels and K efflux
11
Q
phase 4
A
resting potential due to K efflux
