Conductive System Of The Heart Flashcards
1
Q
Which Na+ channel accounts for SA Node automaticity?
A
If Channels (slow “funny” Na+ channels)
2
Q
Which is responsible for setting the HR?
A
Rate of Phase 4 depolarization
3
Q
Inhibition of “pacemaking” of latent pacemakers by the SA Node?
A
Overdrive suppression
4
Q
Condition when latent pacemaker assume pacemaking activity?
A
Ectopic pacemaker
5
Q
Conduction velocity is dependent on which phenomenon?
A
Size of inward current during upstroke of Action Potential
Not dependent on duration of Action Potential
6
Q
What is the basis for AV Nodal Delay (0.13 secs)?
A
⬇️ gap junction on that area
