Cardiac Muscle and Heart Function Quiz

What is the primary characteristic of cardiac muscle in the heart?

• Neurogenic

• Myogenic

• Voluntary

• Skeletal

Where is the sinoatrial node (SA node) located?

• In the left atrium

• In the wall of the right atrium, near the opening of the superior vena cava

• In the interventricular septum

• At the heart apex

What is the role of the SA node in the heart?

• It delays the electrical impulse

• It generates the initial electrical impulse

• It pumps blood into the ventricles

• It contracts the ventricles

What happens when the electrical impulse spreads through the walls of the atria?

• The ventricles depolarize

• The atria depolarize and contract simultaneously

• The AV node generates a new impulse

• The heart stops briefly

Where is the atrioventricular node (AV node) located?

• In the wall between the right and left atria

• Near the opening of the pulmonary artery

• At the heart apex

• In the left ventricle

Why is there a delay at the AV node before the impulse spreads to the ventricles?

• To allow the ventricles to relax

• To allow the atria to finish contracting and empty completely

• To generate a stronger impulse

• To prevent the heart from overworking

What structures conduct the impulse from the AV node to the heart apex and ventricular walls?

• SA node and Purkinje fibers

• Bundle of His, bundle branches, and Purkinje fibers

• Atrial muscles and ventricles

• Superior vena cava and aorta

What happens when the ventricles depolarize?

• The atria contract

• The ventricles contract simultaneously from the heart apex upwards

• The SA node generates a new impulse

• The heart stops briefly

Where is oxygenated blood pumped out from?

• Right ventricle to the pulmonary artery

• Left ventricle to the aorta

• Right atrium to the lungs

• Left atrium to the pulmonary vein

Where is deoxygenated blood pumped out from?

• Left ventricle to the aorta

• Right ventricle to the pulmonary artery

• Left atrium to the lungs

• Right atrium to the superior vena cava