Cardiac Cycle Quiz

What is the cardiac cycle?

• The sequence of events during one heartbeat

• The process of blood clotting

• The breakdown of food in the stomach

• The exchange of gases in the lungs

What does diastole describe in the cardiac cycle?

• A phase when the heart muscle is relaxed

• A phase when the heart muscle is contracted

• The opening of the semilunar valves

• The closing of the atrioventricular valves

During atrial systole, what happens to the atria?

• Atria contract forcing more blood into the ventricles

• Atria relax and fill with blood

• Atria pump blood into the arteries

• Atria remain empty

What happens to the ventricles during ventricular systole?

• Ventricles contract, pressure in ventricles increases

• Ventricles relax

• Ventricles fill with blood

• Ventricles remain empty

What is the role of the semilunar valves during diastole?

• They remain closed

• They open to allow blood flow

• They contract to pump blood

• They relax to fill with blood

What happens to the atrioventricular valves during atrial systole?

• They remain open

• They close

• They contract

• They relax

What is the state of the ventricles during diastole?

• Relaxed

• Contracted

• Empty

• Filled with blood

What is the pressure relationship during atrial systole?

• Atrial pressure > ventricular pressure

• Ventricular pressure > atrial pressure

• Atrial pressure = ventricular pressure

• Atrial pressure < ventricular pressure

What is the role of the semilunar valves during atrial systole?

• They remain closed

• They open

• They contract

• They relax

What causes the semilunar valves to close, resulting in the second heart sound?

• Ventricular pressure > arterial pressure

• Arterial pressure > ventricular pressure

• Atrial pressure > ventricular pressure

• Ventricular pressure falls