What happens during ventricular systole in a mammalian heart?
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
2 )
1 and 3
3 )
2 only
3 only
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