What happens during ventricular systole?
1 The atrioventricular node transmits an electrical signal to the apex of the heart.
2 The pressure in the ventricles drops below the pressure in the atria.
3 The atrioventricular valves close and the semilunar valves open.
1 )
1 and 2 only
2 )
1 and 3 only
3 )
2 only
3 only
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