错题集 Flashcards
1
Q
The depolarization of the SA node (from threshold to peak) is due to the inflow of ___ and ___ ions.
A
sodium; calcium
2
Q
an action potential in a ventricular cardiocyte
A
1) voltage-gated Na channels open
2) influx of Na causes more Na channels to open; depolarization
3) Na channels close as membrane potential peaks at +30mV
4) Ca enters through slow Na channels; create plateau
5) Ca channels close, K channels open; repolarization
3
Q
Closing of the aortic and pulmonary semilunar valves produces the ____ heart sound
A
second
4
Q
Pulmonary edema results from failure of the ___ ventricle
A
left
5
Q
Systemic edema results from failure of the ___ ventricle
A
right
