Cardiac Cycle and Heart Structure Quiz

Which of the following is NOT a chamber of the heart?

• Right atrium

• Left atrium

• Left ventricle

• Pulmonary artery

What is the primary function of the atrioventricular valves?

• To prevent backflow of blood into the ventricles during atrial contraction

• To allow blood flow from the pulmonary artery to the atria

• To prevent backflow of blood into the atria during ventricular contraction

• To allow blood flow from the aorta to the ventricles

During which phase of the cardiac cycle do the atria contract?

• Diastole

• Ventricular systole

• Atrial systole

• Atrial diastole

What happens during ventricular systole?

• Both atria and ventricles relax

• Ventricles contract and atria relax

• Both atria and ventricles contract

• Atria contract and ventricles relax

Which major blood vessel carries oxygenated blood from the heart to the body?

• Pulmonary vein

• Aorta

• Pulmonary artery

• Vena cava

What causes the 'lub' sound in the heart?

• Closing of the atrioventricular valves

• Opening of the semilunar valves

• Opening of the atrioventricular valves

• Closing of the semilunar valves

What is the role of the sinoatrial (SA) node?

• To open the atrioventricular valves

• To close the semilunar valves

• To initiate the electrical activity of the heart

• To pump blood into the ventricles

During which phase do both the atria and ventricles relax?

• Atrial diastole

• Ventricular systole

• Atrial systole

• Diastole

What happens when ventricular pressure exceeds aortic pressure?

• Aortic valve closes

• Aortic valve opens

• Atrioventricular valves open

• Semilunar valves close

Which structure separates the ventricles of the heart?

• Semilunar valves

• Sinoatrial node

• Atrioventricular valves

• Septum