Cardiac Cycle Quiz

What is expected of students to achieve A level understanding of the cardiac cycle?

• Understand the cardiac cycle

• Explain the terms cardiac cycle, diastole, atrial systole, and ventricular systole

• Explain how the valves work in the cardiac cycle

• Describe the cardiac cycle with reference to the action of the valves in the heart and pressure changes

What do the AV valves in the heart connect?

• Atria to ventricles

• Ventricles to pulmonary artery

• Atria to aorta

• Pulmonary artery to aorta

What is the function of the heart valves?

• To regulate blood pressure

• To stop blood flowing the wrong way

• To pump blood out of the heart

• To oxygenate the blood

How do the valves in the heart operate?

• They open and close at random

• They open and close depending on the relative pressure of the heart chambers

• They open and close once per day

• They open and close with the heartbeat

What happens when the pressure is greater behind a heart valve?

• The valve closes

• The valve opens

• The valve gets damaged

• The valve does not respond

What do the SL valves link together in the heart?

• Atria to ventricles

• Ventricles to pulmonary artery and aorta

• Atria to aorta

• Pulmonary artery to aorta

What happens to the ventricles and atria during ventricular diastole?

• The ventricles and atria contract

• The ventricles contract and the atria relax

• The ventricles and atria both relax

• The ventricles relax and the atria contract

What causes the semilunar (SL) valves to close during ventricular diastole?

• Low pressure in the ventricles

• High pressure in the ventricles

• High pressure in the pulmonary artery and aorta

• Low pressure in the atria

When do the atrioventricular (AV) valves open during the cardiac cycle?

• When the pressure in the atria is lower than in the ventricles

• When the pressure in the ventricles is higher than in the atria

• When the pressure in the atria is higher than in the ventricles

• When the pressure in the ventricles and atria is equal

How does blood flow into the ventricles from the atria during ventricular diastole?

• Actively, with the help of the heart's pumping action

• Passively, due to the contraction of the atria

• Passively, due to the relaxation of the ventricles

• Actively, due to the contraction of the ventricles