Cardiac Cycle

Front

What is considered normal blood pressure?

Back

120/80 mmHg and below

Front

What causes the 'Dub' sound in the heart?

Back

Semilunar valves closing

Front

During which phase are the semilunar valves open?

Back

Ventricular ejection

Front

What does the top number in a blood pressure reading represent?

Back

Pressure during ventricular contraction

Front

What happens when the ventricles contract?

Back

The AV valves close, blood is ejected into the aorta, and the semilunar valves open.

Front

What are the two main phases of the cardiac cycle?

Back

Systole and diastole

Front

What occurs during systole?

Back

The heart muscles contract, pumping blood out of the chambers.

Front

What occurs during diastole?

Back

The heart muscles relax, allowing the chambers to fill with blood.

Front

What is the role of the atrioventricular (AV) valves?

Back

To prevent backflow of blood from the ventricles to the atria during contraction.

Front

What is the function of the semilunar valves?

Back

To prevent backflow of blood from the aorta and pulmonary trunk into the ventricles.