Which of these occurs during the atrial systole?
A. Both atria contract simultaneously
B. Action potential is generated by the AVN initially
C. Tricuspid valve closes
D. The semilunar valves remain open
Answer:A
Which of these occurs during the atrial systole?
A. Both atria contract simultaneously B. Action potential is generated by the AVN initially C. Tricuspid valve closes D. The semilunar valves remain open