Master Cardiac Cycle - Diastole with Picmonic for Pre-Health

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Cardiac Cycle - Diastole

Dice in Heart
Picmonic
Diastole is the stage of the cardiac cycle associated with refilling the heart with blood. It begins when the sinoatrial (SA) node fires, which occurs independently, without any nervous system input. This causes both atria to contract uniformly, pushing blood out of the atria and into the ventricles. However, in order for blood to flow, the two atrioventricular (AV) valves need to be open. The valve between the right atrium and ventricle is the tricuspid valve, and it opens in response to atrial pressure. The valve between the left atrium and ventricle is the mitral valve (or bicuspid valve), and it also opens in response to atrial pressure. The ventricles fill with blood pushed out of the atria, but the aortic and pulmonary valves, on the other side of the ventricles, need to be closed for proper diastolic filling. The pulmonary valve is between the right ventricle and pulmonary artery, and the aortic valve is between the left ventricle and aorta. Both are closed to prevent backflow from the previous cycle’s systole, and also to allow the ventricles to fill properly. Thus, diastole begins with the atria filled with blood and ends with the ventricles filled with blood.
7 KEY FACTS
CHARACTERISTICS
Sinoatrial (SA) Node Fires
Silo-nose jolting A-Trees

The initiating event in diastole is the sinoatrial node firing. The impulse initiating at the sinoatrial node occurs independently, without neuronal input.

Atrial Contraction
A-trees Flexing

The sinoatrial node spreads a depolarization wave causing the two atria to contract simultaneously, pushing blood out into the ventricles.

Tricuspid Valve Opens
Tricycle-cupid-valve is Open

The tricuspid valve is between the right atrium and right ventricle, and it opens in response to increased pressure.

Mitral Valve Opens
Mitt-troll allowing Dice through

The mitral valve is located in between the left atrium and left ventricle, and it also opens because of pressure from the atrium contracting.

Ventricular Filling
Vent-chambers Filling with dice

The ventricles fill with blood due to atrial contraction, as blood flows through the atrioventricular valves (AV valves), which are the tricuspid and mitral valves.

Pulmonary Valve Closes
Lung-guy holding Valve Closed

The pulmonary valve is between the right ventricle and pulmonary artery, and it is closed during diastole. This allows blood to fill the ventricles properly, and also prevents backflow into the ventricle from the previous systolic cycle.

Aortic Valve Closes
A-orca Valve is Closed

The aortic valve is between the left ventricle and aorta. It is closed to allow the left ventricle to fill properly, as well as prevent backflow from the previous systolic cycle.

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