The chamber in the heart that receives oxygenated blood from the lungs.

• Aorta

• AV node

• Inferior vena cava

• Left atrium

Responsible for distributing electrical impulses throughout the heart.

• Aorta

• AV node

• Inferior vena cava

• Left atrium

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

• Aorta

• AV node

• Inferior vena cava

• Left atrium

When blood leaves this chamber of the heart, it heads out to the body.

• Left ventricle

• Pulmonary trunk

• Pulmonary veins

• Right atrium

This blood vessel splits in two and sends oxygen-poor blood to the lungs.

• Left ventricle

• Pulmonary trunk

• Pulmonary veins

• Right atrium

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

• Left ventricle

• Pulmonary trunk

• Pulmonary veins

• Right atrium

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

• Right ventricle

• SA node

• Semilunar valves

• Tricuspid and

  bicuspid valves

Initiates the action potential that causes the heart to beat.

• Right ventricle

• SA node

• Semilunar valves

• Tricuspid and

  bicuspid valves

Stops blood from flowing back into the ventricles each time they contract.

• Right ventricle

• SA node

• Semilunar valves

• Tricuspid and

  bicuspid valves

Prevents blood from flowing back into the atria when the ventricles contract.

• Right ventricle

• SA node

• Semilunar valves

• Tricuspid and

  bicuspid valves