The reason why tricuspid and bicuspid valves are closed is_______
A. ventricular relaxation
B. ventricular filling
C. atrial systole
D. attempted backflow of blood into the atria
Answer:D
The reason why tricuspid and bicuspid valves are closed is_______
A. ventricular relaxation B. ventricular filling C. atrial systole D. attempted backflow of blood into the atria