Cardiac System Quiz

Which structure serves as the heart's primary pacemaker?

• AV

• Bundle of

• SA Node

• Purkinje Fibers

What is the function of the AV node in the cardiac conduction system?

• Initiate electrical signals

• Distribute signals to the ventricles

• Delay impulses to allow ventricular filling

• Ensure coordinated ventricular contraction.

If both the SA and AV nodes fail, what maintains the heart rhythm?

• Bundle of His

• Purkinje Fibers

• Ventricular pacemakers

• The heart stops beating

Which heart chambers receive blood from the body and lungs?

• Ventricles

• Atria

• Septum

• Aorta

What is the name of the valve located between the right atrium and right ventricle?

• Tricuspid valve

• Mitral valve

• Pulmonary valve

• Aortic valve

Which valve prevents blood from flowing back into the left ventricle?

• Pulmonary valve

• Tricuspid valve

• Mitral valve

• Aortic valve

What is the function of the papillary muscles?

• Contract the ventricles

• Open the AV valves

• Prevent AV valve prolapse during ventricular contraction

• Regulate heart rate

Which layer of the heart wall is responsible for the pumping action?

• Epicardium

• Myocardium

• Endocardium

• Pericardium

What is the term for the contraction phase of the cardiac cycle?

• Systole

• Diastole

• Repolarization

• Depolarization

During which phase of the cardiac cycle do the ventricles fill with blood?

• Systole

• Diastole

• Atrial contraction

• Isovolumetric relaxation