Which statement is true about systole?
a. At the onset of systole, the pressure in the ventricles is less than that in the atria.
b. During this phase, the mitral and tricuspid valves close, producing the first heart sound.
c. Blood flows from the atria into the ventricles.
d. The atria contract sending blood into the ventricles.
B
At the onset of systole, an increase in ventricular pressure causes the mitral and tricuspid valves to close. The closing of these valves produces the first heart sound or S1.
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