Which of the following statements accurately describes the pressure in the atria and ventricles at the beginning of the cardiac cycle?
A) Pressure is highest in the atria and lowest in the ventricles.
B) Pressure is lowest in the atria and highest in the ventricles.
C) Pressure is equal in the chambers of the heart.
D) We're unsure of the pressure in the beginning of the cardiac cycle.
A
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