When the heart's atrioventricular valve is closed and the arterial valve is open, the heart's atrioventricular diastolic state is________
A. Simultaneous contraction of atrium and ventricle
B. Atrial contraction, ventricular relaxation
C. Simultaneous relaxation of atrium and ventricle
D. Atrial relaxation, ventricular contraction
Answer:D
When the heart's atrioventricular valve is closed and the arterial valve is open, the heart's atrioventricular diastolic state is________
A. Simultaneous contraction of atrium and ventricle B. Atrial contraction, ventricular relaxation C. Simultaneous relaxation of atrium and ventricle D. Atrial relaxation, ventricular contraction