Sinoatrial (SA) Node or "Pacemaker"
Ventricles.
Contraction of the ventricles
during the systole phase of the heart contraction.
Contraction of the ventricles and atria is called systole. Relaxation is called diastole.
Q,R,and S waves
Q,R,and S waves
Q,R,and S waves
The AV valves close in response to the contraction of the ventricles to prevent the backflow of blood from the ventricles into the atria, ensuring that blood flows in the correct direction through the heart and body.
The heart has two contraction cycles, one is the systole and the other one is the diasole. Both are fired by one impulse from the Cranial Nerve X. The delay required for the ventricles to contract are a result of the atrrioventricular node that pauses the impule until the ventricles are filled with blood.
is the sthrenght of the last contraction of the ventricles of the heart, at the end of the cardiac cycle.
Heart has to beat periodically. Atrial chambers of your heart receive blood from your body and lungs. This is pushed to your ventricles by contraction of the atrial chambers, leading to formation of beats. The ventricles also have to pump blood to your lungs and body by contraction of the ventricles. You need time to fill the ventricles and you need to contract the ventricles. This leads to formation of heart beats. Continuous flow, with out beats is not possible here. Although the blood flows continuously. Because, when the ventricles relax, the arterial system, contracts.
the sinoatrial (SA) node