The following steps involved in a Heartbeat from the moment the blood enters the heart

The following steps involved in a Heartbeat from the moment the blood enters the heart
1. Atria contract
2.ventricles contract
3. atria relax
4. ventricles relax
5. atria and ventricles fill with blood

-I listed in order: #s: 3,5,1,4,2 ??

2)- the Lub sound occurs after _____i___ and dub sound occurs after ____ii_____

A) I) atria contract ii) ventricles contract
B) I) atria relax ii) ventricles contract
C) I) atria contract ii) ventricles relax
D) atria relax ii) ventricles relax
** I think it's A?

3) blood pressure is measured in mmHg written ___i____ over ______ii______
A) atria are contracting  ii) atria are relaxed
B) ventricles are relaxed  ii) ventricles are contracting
C) ventricles are contracting    ii) ventricles are relaxed
D) atria relaxed.      ii) atria are contracting
**i think C