electrophysiology CV Flashcards
0
Q
phase 2
A
slow Ca voltage gated channels- ventr. mus.
1
Q
phase 1
A
Na fast voltage channels- ventr. mus.
2
Q
phase three
A
potassium voltage gated channels repolarize- ventr. mus.
3
Q
phase 4
A
refractory period- ventr. mus.
4
Q
what channels do only pacemaker cells posses
A
funny voltage (hyperpolarization) gated sodium channels
5
Q
what resting pot do pacemaker nodes have compared with myocardial cells
A
node= -60 myocarial=-90
6
Q
what ion causes pacemaker cell depolarization
A
Ca (after Na graded pot)
7
Q
K concentrations
A
inside: 150mM
outside: 4mM
8
Q
Na concentrations
A
inside: 20mM
outside: 145 mM
9
Q
Ca concentrations
A
inside: 0.0001mM
outside: 2.5 mM
10
Q
PR interval
A
SA to Bundles of His depol
11
Q
ST interval
A
ventricular repolarization
13
Q
QRS duration
A
ventricular myocardial depolarization
