Immediately following the P wave of the electrocardiogram, an A wave appears on both the left and right heart pressure graphs. This A wave corresponds to which of the following?
a. Atrial contraction
b. Atrioventricular valve closure
c. Semilunar valve closure
d. Ventricular contraction
ANS: A
The P wave signals atrial depolarization. Within 0.1 sec, the atria contract, causing a slight rise in both atrial and ventricular pressures (the A waves).
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