Cardiovascular System

What prevents blood from flowing back into the atria when the ventricles contract?

• semilunar valves

• sinoatrial node

• atrioventricular node

• tricuspid and bicuspid valves

When blood leaves this chamber of the heart, it heads out to the body (not the lungs)

• left atrium

• right atrium

• left ventricle

• right ventricle

One of the body's largest blood vessels that transports blood from the body region below the diaphragm to the heart

• superior vena cava

• inferior vena cava

• pulmonary trunk

• pulmonary veins

When this chamber contracts, it pushes blood through the tricuspid valve

• right atria

• right ventricle

• left atria

• left ventricle

This initiates the action potential that causes the heart to beat

• Inferior vena cava

• Atrioventricular node (AV node)

• Superior vena cava

• Sinoatrial node (SA node)

When blood leaves this chamber of the heart, it heads to the lungs

• right atrium

• right ventricle

• left atrium

• left ventricle

This stops blood from flowing back into the ventricles each time they contract

• semilunar valves

• tricuspid and bicuspid valves

• Sinoatrial node (SA node)

• Aorta

This is responsible for distributing electrical impulses through the heart

• Atrioventricular node

• Sinoatrial node

• Inferior vena cava

• Superior vena cava

This blood vessel splits in two and sends oxygen-poor blood away from the heart and to the lungs

• aorta

• pulmonary veins

• superior vena cava

• pulmonary trunk

This chamber of the heart receives oxygenated blood from the lungs

• right atrium

• right ventricle

• left atrium

• left ventricle