Advanced Cardiology Quiz

What are the ridges formed by raised bundles of cardiac muscle fibers on the internal surface of the ventricles called?

• Trabeculae carneae

• Purkinje fibers

• Intercalated disks

• AV bundle

What is the outer layer of the heart also known as?

• Endocardium

• Pericardium

• Myocardium

• Epicardium

During a mitral valve prolapse, into which chamber does a portion of the bicuspid valve protrude?

• Right atrium

• Right ventricle

• Left ventricle

• Left atrium

Which artery carries blood to the heart's muscle itself?

• Carotid artery

• Coronary artery

• Aorta

• Pulmonary artery

What is the correct sequence of flow of an electrical impulse through the heart?

• SA node – AV node – Purkinje fibers – AV bundle

• AV bundle – SA node – AV node – Purkinje fibers

• AV node – SA node – AV bundle – Purkinje fibers

• SA node – AV node – AV bundle – Purkinje fibers

During repolarization of a cardiac muscle fiber, which ion moves out of the cell?

• K+

• Ca2+

• Cl-

• Na+

What is the only site where action potentials can conduct from the atria to the ventricles?

• Intercalated disks

• AV bundle

• Purkinje fibers

• SA node

What phase of the action potential in cardiac muscle is due to the inflow of Ca2+?

• Depolarization phase

• Plateau phase

• Repolarization phase

• Hyperpolarization phase

What allows action potentials to pass from one cardiac muscle cell to another?

• SA node

• Purkinje fibers

• Gap junctions

• AV bundle

What is the name of the original stem cell during hemopoiesis?

• Lymphoblast

• Osteoblast

• Hemocytoblast

• Myoblast