Quiz on Cardiac Cycle

What occurs during atrial systole?

• Both atria and ventricles contract simultaneously

• Both atria contract while both ventricles relax

• Both ventricles contract while both atria relax

• Both atria and ventricles relax simultaneously

What happens to the AV valves during ventricular systole?

• They open to allow blood flow into the atria

• They close to prevent backflow of blood into the atria

• They remain closed throughout the phase

• They open to allow blood flow into the ventricles

What sound is produced by the recoil of blood against the closed AV valves?

• Dupp sound

• Doppler sound

• Lubb sound

• Lub sound

During which phase do both atria and ventricles relax?

• Ventricular systole

• Isovolumetric contraction

• Atrial systole

• Atrial & ventricular diastole

What causes the semilunar valves to close during diastole?

• Lower pressure in the aorta and pulmonary artery

• Higher pressure in the aorta and pulmonary artery

• Lower pressure in the atria

• Higher pressure in the ventricles

How long does the atrial & ventricular diastole phase last?

• 0.1 seconds

• 0.4 seconds

• 0.3 seconds

• 0.5 seconds

What is the primary function of the semilunar valves during ventricular systole?

• To open and allow blood to flow into the atria

• To allow blood to flow from the ventricles into the arteries

• To prevent backflow of blood into the ventricles

• To close and prevent blood from entering the ventricles

Which event occurs immediately after the closure of the AV valves?

• Ventricular contraction begins

• Atrial contraction begins

• Blood flows into the atria

• Semilunar valves open

What is the duration of the entire cardiac cycle in a healthy adult?

• 0.8 seconds

• 1.2 seconds

• 1.0 seconds

• 0.6 seconds