After the blood pumps from the atria to the ventricles, during systole.
Systole
lots :)
A junction box, also known as the AV node, is how electrical impulses in the heart are relayed to the ventricles. The ventricles help make the muscle contract and then pump the blood.
If the papillary muscles fail to contract the valves will prolapse. The papillary muscles are located in the ventricles and contract to prevent prolapse.
SA node.
systolic to diastolic
Purkinje Fibers actually makes the ventricles contract.
The ventricles contract.
When relaxed, the atria expand, and then the ventricles contract.
Not really sure what you mean by the base, the ventricles contract from the Apex (which is at the bottom) upwards.
The pulmonary artery and the aorta lead upward and away from the ventricles. Since the ventricles contract from the bottom, blood is more efficiently pushed out of the heart.
Yes, atria contracts before the ventricles.
Systole
Into the heart
contract
The right ventricle pumps blood to the lungs.
They normally contract together.
The ventricles contract to pump blood out of the heart.